{"data":{"slug":"fitbit-sense-2","type":"smartwatch","brand":"Fitbit","name":"Sense 2","aliases":["Fitbit Sense 2 by Google","Google Fitbit Sense 2","FB521"],"release_date":"2022-09-29","url":"https://arkivo.dev/smartwatches/fitbit-sense-2","specs":{"series":"Sense","model_numbers":["FB521","FB521BKGB-US","FB521SRWT-US","FB521GLBM-US"],"gtins":["810073611429","810073611443","810073611436"],"announce_date":"2022-08-24","status":"available","predecessor":null,"successor":null,"launch_price_usd":299.95,"launch_price_eur":299.95,"markets":["US","GB","DE","AU"],"colors":["Shadow Grey / Graphite Aluminum","Lunar White / Platinum Aluminum","Blue Mist / Soft Gold Aluminum"],"manufacturer_url":"https://store.google.com/us/product/fitbit_sense_2?hl=en-US","spec_sheet_url":"https://store.google.com/us/product/fitbit_sense_2_specs?hl=en-US","manual_url":"https://storage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0d","eprel_registration_number":null,"warranty_years":1,"segment":"smartwatch","os_updates_years":null,"security_updates_until":null,"case_sizes_mm":null,"case_shape":"rectangular","case_material":"aluminium","case_material_name":"Aluminum","back_material":null,"case_dimensions_mm":{"height_mm":40.5,"width_mm":40.5,"thickness_mm":11.2},"weight_g":null,"weight_with_strap_g":null,"water_resistance_atm":5,"water_resistance_standard":"IEC 60529","ip_rating":["IP6X","IPX8"],"dive_rating":null,"dive_max_depth_m":null,"mil_std_810":null,"mil_std_810_tests":null,"operating_temperature_c":{"min_c":-10,"max_c":45},"display_technology":"oled","display_technology_name":"AMOLED","screen_size_in":1.58,"resolution":{"width_px":336,"height_px":336},"pixel_density_ppi":null,"display_area_mm2":null,"touchscreen":true,"refresh_rate_max_hz":60,"refresh_rate_min_hz":null,"brightness_peak_nits":1000,"brightness_min_nits":null,"always_on_display":true,"display_cover_material":"gorilla_glass","display_cover":"Corning Gorilla Glass 3","platform":"proprietary","os_at_launch":"Fitbit OS","os_skin":null,"os_latest":"Fitbit OS, firmware 220.31","compatible_phone_os":["ios","android"],"phone_os_requirement":"Google Health app on a compatible device running Apple iOS 16.4 or higher or Android OS 11.0 or higher","third_party_apps":false,"voice_assistants":["Amazon Alexa"],"chipset":"Ambiq Apollo4 Plus","process_node_nm":null,"cpu_core_count":1,"cpu_clusters":[{"count":1,"core_name":"Arm Cortex-M4","max_ghz":0.192}],"cpu_max_ghz":0.192,"gpu":null,"low_power_coprocessor":null,"ram_gb":[0.00275],"storage_gb":[4],"heart_rate_sensor":"Multi-path optical heart rate sensor","ecg":true,"spo2":true,"skin_temperature":true,"blood_pressure":"none","bioimpedance":false,"eda_sensor":true,"medical_clearances":["ECG app: FDA clearance","ECG app: EU clearance","Irregular Heart Rhythm Notifications: FDA clearance","Irregular Heart Rhythm Notifications: EU clearance"],"accelerometer":true,"accelerometer_max_g":null,"gyroscope":true,"barometer":true,"compass":false,"ambient_light_sensor":true,"depth_gauge":null,"depth_gauge_max_m":null,"water_temperature_sensor":null,"health_features":["continuous_heart_rate","heart_rate_alerts","irregular_rhythm_notifications","ecg_app","blood_oxygen_app","hrv","sleep_tracking","sleep_stages","stress_tracking","readiness_score","cycle_tracking"],"fitness_features":["auto_workout_detection","vo2_max","pool_swim","interval_workouts","turn_by_turn_navigation"],"sport_profiles_count":null,"dive_modes":null,"external_sensor_types":null,"fall_detection":false,"crash_detection":false,"emergency_sos":false,"emergency_siren_db":null,"live_tracking":null,"led_flashlight":false,"positioning":["GPS","GLONASS"],"dual_frequency_gnss":null,"offline_maps":false,"bluetooth":true,"bluetooth_version":"5.0","wifi":false,"wifi_standard":null,"wifi_bands":null,"cellular":false,"network_technologies":null,"bands_4g":null,"bands_5g":null,"nfc":true,"nfc_payments":true,"payment_services":["Google Wallet"],"uwb":false,"satellite_connectivity":["none"],"ant_plus":null,"speaker":true,"microphone_count":null,"calls_on_watch":"phone_only","offline_music":false,"button_count":1,"hardware_buttons":["Button"],"crown":"none","rotating_bezel":"none","gesture_controls":["Turn your wrist","Briefly cover the watch face with your opposite hand","Triple-tap the screen"],"battery_capacity_mah":162,"battery_life_claimed":[{"mode":"smartwatch","with_solar":false,"hours":144},{"mode":"always_on","with_solar":false,"hours":72},{"mode":"gps","with_solar":false,"hours":5}],"battery_life_smartwatch_claimed_h":144,"battery_life_always_on_claimed_h":72,"battery_life_gps_claimed_h":5,"solar_charging":null,"charging_method":"magnetic_pins","charging_notes":null,"charging_max_w":null,"fast_charging":true,"quick_charge":{"charge_min":12,"use_h":24},"charge_time_0_80_min":null,"charge_time_0_100_min":120,"measured_brightness_nits":null,"measured_battery_active_use_h":144,"battery_life_measured":[{"test":"mixed_use_always_off","hours":144}],"measured_charge_time_min":95,"band_width_mm":24,"quick_release":true,"band_compatibility":"Proprietary latch connector. Fitbit Sense, Versa 3 and Versa 4 bands are compatible.","band_material":"other","band_name":"Classic band","band_sizes":[{"size_label":"Small","wrist_min_mm":140,"wrist_max_mm":180},{"size_label":"Large","wrist_min_mm":180,"wrist_max_mm":220}],"fcc_ids":["XRAFB521"],"sar_limb_w_kg":null,"sar_eu_limb_w_kg":null,"other_certifications":["RED (2014/53/EU)","UK Radio Equipment Regulations 2017","IEC 62368-1:2014","IEC 62368-1:2020 + A11:2020","ISED Canada (IC: 8542A-FB521)"],"in_the_box":["Fitbit Sense 2","Classic band (small & large)","Charging cable"],"charger_in_box":false},"variants":[{"model_number":"FB521BKGB-US","gtins":["810073611429"],"colors":["Shadow Grey / Graphite Aluminum"],"markets":["US"]},{"model_number":"FB521SRWT-US","gtins":["810073611443"],"colors":["Lunar White / Platinum Aluminum"],"markets":["US"]},{"model_number":"FB521GLBM-US","gtins":["810073611436"],"colors":["Blue Mist / Soft Gold Aluminum"],"markets":["US"]}],"sources":[{"url":"https://storage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0d","kind":"manual","accessed":"2026-10-23","fields":["model_numbers","case_material","case_material_name","manual_url","water_resistance_standard","ip_rating","operating_temperature_c","touchscreen","always_on_display","bluetooth","bluetooth_version","wifi","nfc","nfc_payments","payment_services","cellular","uwb","speaker","calls_on_watch","button_count","hardware_buttons","crown","rotating_bezel","gesture_controls","quick_charge","charge_time_0_100_min","charging_method","quick_release","band_compatibility","band_material","band_sizes","fcc_ids","other_certifications","in_the_box","charger_in_box","heart_rate_sensor","ecg","spo2","skin_temperature","eda_sensor","bioimpedance","accelerometer","gyroscope","barometer","compass","ambient_light_sensor","voice_assistants","positioning","health_features","fitness_features","third_party_apps"],"notes":{"model_numbers":"Regulatory notices name Model FB521 with FCC ID XRAFB521. The retail colour model numbers come from the Abt listings.","case_material":"Materials: the housing and buckle on Sense 2 are made of aluminum.","case_material_name":"Materials: the housing is aluminum. The store names the finishes Graphite, Platinum and Soft Gold Aluminum.","manual_url":"Fitbit user manual, version 3.1, hosted on the Google Health Help Center user manuals page.","water_resistance_standard":"IP Rating, printed page 78: Model FB521 has a water resistance rating of IPX8 under IEC 60529, up to a depth of 50 meters. IEC 60529 covers ingress, so no ISO pressure standard is inferred.","ip_rating":"IP Rating: IPX8 under IEC 60529 up to 50 m, and IP6X dust-tight. Stored as the two published codes.","operating_temperature_c":"Environmental conditions, printed page 63: operating temperature 14 to 113 F (-10 to 45 C). Non-operating and charging ranges (0 to 35 C) are not stored.","touchscreen":"Navigate Sense 2: color AMOLED touchscreen display and 1 button.","always_on_display":"Adjust always-on display section. The setting reduces battery life.","bluetooth":"Wireless technology: Bluetooth 5.0 radio transceiver and NFC chip.","bluetooth_version":"Wireless technology, printed page 62: Bluetooth 5.0 radio transceiver and NFC chip.","wifi":"Sensors and Components: WiFi (deactivated, cannot be turned on). Stored as false because the user cannot use it. No Wi-Fi standard is stored.","nfc":"Wireless technology: NFC chip. Contactless Payments section describes the built-in NFC chip.","nfc_payments":"Contactless Payments: set up Google Wallet in the Fitbit app and pay at contactless terminals.","payment_services":"Contactless Payments: Google Wallet. The text also names Fitbit Pay for the older service name.","cellular":"No cellular radio is listed in Wireless technology (Bluetooth and NFC only).","uwb":"Wireless technology lists only a Bluetooth radio and an NFC chip. No UWB radio.","speaker":"Sensors and Components lists Speaker and Microphone. The Google Store rates the speaker at 75 dB SPL at 10 cm. That is not an emergency siren.","calls_on_watch":"Answer or reject phone calls and Take on-wrist phone calls: calls go through the paired iPhone or Android phone, which must be nearby with the Fitbit app running. No cellular model exists.","button_count":"Navigate Sense 2: color AMOLED touchscreen display and 1 button.","hardware_buttons":"Navigate Sense 2: the single button opens the apps menu, returns to the clock face and has long-press and double-press shortcuts.","crown":"Navigate Sense 2 describes only the touchscreen and 1 button. No crown.","rotating_bezel":"Navigate Sense 2 describes only the touchscreen and 1 button. No bezel control.","gesture_controls":"Screen wake setting: Button & motion turns the screen on when you turn your wrist. Turn off the screen: briefly cover the watch face with your opposite hand, except with always-on display. Screen Zoom: Magnify works on a triple-tap.","quick_charge":"Charge your watch: charge Sense 2 for 12 minutes for 24 hours of battery life. The usage workload is not named.","charge_time_0_100_min":"Charge your watch: charging fully takes about 1-2 hours. The Google Store spec page states two hours and is stored.","charging_method":"Charge your watch: hold the cable end near the port on the back until it attaches magnetically. The pins on the cable align with the port on the back.","quick_release":"Change the band: slide the flat latch button toward the band, pull the band away. Attach by pressing until it clicks. No tools.","band_compatibility":"Change the band: Fitbit Sense, Fitbit Versa 3, and Fitbit Versa 4 bands are compatible with Sense 2. Band latches on the back. No lug width is stated in the manual.","band_material":"Materials: the supplied band is a flexible, durable elastomer similar to the material used in many sports watches. Other preserves that wording without guessing silicone, HNBR or fluoroelastomer.","band_sizes":"Band size, printed page 63: Small band fits a wrist of 140 to 180 mm (5.5 to 7.1 in), Large band 180 to 220 mm (7.1 to 8.7 in). The Google Store page prints different ranges (130 to 180 mm and 165 to 220 mm). The manual is preferred. These are the supplied straps.","fcc_ids":"USA FCC statement: Model FB521, FCC ID XRAFB521.","other_certifications":"EU section: Fitbit LLC declares Model FB521 compliant with Directive 2014/53/EU. UK section: Radio Equipment Regulations 2017. Safety Statement lists IEC 62368-1:2014 and IEC 62368-1:2020 + A11:2020. Canada section lists IC 8542A-FB521. These are model declarations, not medical, military or diving certifications.","in_the_box":"What's in the box: watch with small band, charging cable and an additional large band.","charger_in_box":"What's in the box lists the watch, bands and the charging cable. No power adapter. The cable plugs into a USB port or a UL-certified USB wall charger.","heart_rate_sensor":"Sensors and Components: multi-path optical heart rate tracker. The Google Store spells it Multi-path optical heart rate sensor.","ecg":"Sensors and Components: multipurpose electrical sensors compatible with the ECG app and EDA Scan app. The ECG app is not available in all countries.","spo2":"Sensors and Components: red and infrared sensors for oxygen saturation (SpO2) monitoring.","skin_temperature":"Sensors and Components: on-wrist skin temperature sensor. Track your skin temperature changes: nightly variation from a personal baseline. Not available in all markets.","eda_sensor":"Sensors and Components: electrical sensor to measure skin conductance (cEDA) for stress detection. Manage stress: continuous EDA identifies body responses.","bioimpedance":"The complete sensor list in Sensors and Components has no bioelectrical impedance sensor.","accelerometer":"Sensors and Components: 3-axis accelerometer.","gyroscope":"Sensors and Components: gyroscope.","barometer":"Sensors and Components: altimeter, which tracks altitude changes.","compass":"The complete sensor list in Sensors and Components has no compass or magnetometer. Gadgets & Wearables also lists Compass: No.","ambient_light_sensor":"Sensors and Components: ambient light sensor.","voice_assistants":"Voice Assistant: Amazon Alexa Built-in. Needs the phone app running in the background. Not available in all countries.","positioning":"Sensors and Components: built-in GPS receiver + GLONASS. Dynamic GPS can use the phone's GPS instead to save battery. No band or dual-frequency claim.","health_features":"Today and sleep sections: sleep stages (REM, light, deep) and sleep score, stress management score, readiness score (Premium), menstrual health tile, high and low heart rate notifications after 10 inactive minutes, heart-rate variability under Advanced health metrics, oxygen saturation. Daily readiness score needs Fitbit Premium. Irregular rhythm notifications and the ECG app come from the Fitbit blog.","fitness_features":"Exercise settings list Pool Length, Interval, Auto Start and Auto-Stop. Track your exercise automatically (SmartTrack, 15 minute minimum). Google Maps gives turn-by-turn directions and needs the paired phone nearby with the app running. View your cardio fitness score (stored as vo2_max, see the Google Health VO2 max help page).","third_party_apps":"The Fitbit Gallery offers Fitbit apps and clock faces. Tom's Guide states third-party apps cannot be downloaded."}},{"url":"https://store.google.com/us/product/fitbit_sense_2_specs?hl=en-US","kind":"manufacturer_page","accessed":"2026-10-23","fields":["case_dimensions_mm","colors","spec_sheet_url","segment","platform","display_technology","display_technology_name","display_cover_material","display_cover","battery_life_claimed","charge_time_0_100_min","water_resistance_atm","compatible_phone_os","phone_os_requirement","in_the_box","band_name","ecg","markets","status","heart_rate_sensor","accelerometer"],"notes":{"case_dimensions_mm":"Dimensions and weight: length 40.5 mm, width 40.5 mm, height 11.2 mm. The page states no sensor exclusion. The same page states weight 37.64 g without saying whether the band is included, so no weight is stored.","colors":"Colors: Shadow Grey / Graphite Aluminum, Lunar White / Platinum Aluminum, Blue Mist / Soft Gold Aluminum.","spec_sheet_url":"This page is the maker's technical specs page for Sense 2.","segment":"Page title: Fitbit Sense 2 Smartwatch. The Aug 24, 2022 Fitbit blog calls it a health-focused smartwatch.","platform":"No OS name is printed on the spec page. The Fitbit blog says the watch is powered by the new Fitbit OS, a proprietary platform with its own Gallery.","display_technology":"Display: AMOLED display.","display_technology_name":"Display: AMOLED display.","display_cover_material":"Display: Corning Gorilla Glass 3.","display_cover":"Display: Corning Gorilla Glass 3.","battery_life_claimed":"Battery and power: battery life of 6+ days, stored as 144 h as a minimum figure. Up to 5 hours with continuous GPS, stored as the gps row. The always-on display, SpO2 and cEDA sensor need more frequent charging. The Google Health support article states up to 12 hours with continuous GPS for Sense 2, a conflict. The model spec page is used because the Oct 2022 Fitbit.com page printed the same 5 hours.","charge_time_0_100_min":"Battery and power: the Oct 2022 Fitbit.com spec text states charge time (0-100%): two hours.","water_resistance_atm":"Water resistance: water resistant to 50 m. The Google compare page states 5 ATM.","compatible_phone_os":"Requirements: Apple iOS 16.4 or higher, Android OS 11.0 or higher, current on the access date.","phone_os_requirement":"Requirements: the Google Health app on a device running Apple iOS 16.4 or higher or Android OS 11.0 or higher. This is the current requirement. The 2022 launch requirement may have been lower.","in_the_box":"What's in the box: Fitbit Sense 2 Classic band (Small and Large), charging cable.","band_name":"What's in the box: Classic band (Small and Large).","ecg":"Sensors: multipurpose electrical sensors compatible with ECG app and EDA app. ECG not available in all countries.","markets":"US, GB, DE and AU Google Stores offer the model with a Buy button. Current prices are not launch prices.","status":"The Google Store sells Sense 2 at 249.95 USD on the access date. That is a current price, not the launch price.","heart_rate_sensor":"Sensors and components: multi-path optical heart rate sensor.","accelerometer":"Sensors and components: 3-axis accelerometer."}},{"url":"https://store.google.com/us/product/fitbit_sense_2?hl=en-US","kind":"manufacturer_page","accessed":"2026-10-23","fields":["nfc_payments","voice_assistants","fitness_features","health_features","medical_clearances","band_width_mm","always_on_display","manufacturer_url"],"notes":{"nfc_payments":"Smarts and more: Google Wallet, make purchases from your wrist everywhere Google Pay is accepted.","voice_assistants":"Smarts and more: Alexa Built-in.","fitness_features":"Fitness features: Cardio Fitness Score estimated from VO2 max, SmartTrack Automatic Exercise Recognition (in app only), Google Maps turn-by-turn directions.","health_features":"Heart rate tracking, high and low heart rate notifications, irregular heart rhythm notifications, ECG app, HRV, breathing rate, SpO2, sleep tracking and sleep stages, Stress Management Score, Daily Readiness Score, menstrual health tracking. The Daily Readiness Score is a Premium feature in the manual.","medical_clearances":"Heart section: the ECG app assesses heart rhythm for atrial fibrillation. Clearance wording is in the Fitbit blog.","band_width_mm":"The store shows an accessory shop headed Shop 24mm attach accessories. Fitbit publishes no lug width in a spec table, and the connector is proprietary, so this is the maker's attach size only.","always_on_display":"Always-on display mode: keeps your display on at all times (may require more frequent charging).","manufacturer_url":"Google Store product page for Fitbit Sense 2 (US)."}},{"url":"https://blog.google/products-and-platforms/devices/fitbit/versa-4-sense-2/","kind":"press_release","accessed":"2026-10-23","fields":["announce_date","series","launch_price_usd","eda_sensor","os_at_launch","positioning"],"notes":{"announce_date":"Blog post dated Aug 24, 2022. Pre-orders started that day with worldwide availability that fall.","series":"Fitbit names the product Sense 2 in its Sense line and calls it its most advanced health-focused smartwatch.","launch_price_usd":"Versa 4 is available for $229.95 and Sense 2 is available for $299.95 (USD). US prices exclude sales tax.","eda_sensor":"Sense 2 has a new Body Response sensor for continuous electrodermal activity (cEDA).","os_at_launch":"Powered by the new Fitbit OS. No version number is published.","positioning":"Built-in GPS is named for Sense 2."}},{"url":"https://blog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4/","kind":"press_release","accessed":"2026-10-23","fields":["release_date","medical_clearances","fast_charging"],"notes":{"release_date":"Blog post dated Sep 29, 2022: Sense 2 is now available at $299.95 (USD) at Fitbit.com, Google Store and select global retailers. The date uses the stated availability.","medical_clearances":"Footnote and text: the ECG app on Sense 2 and the Irregular Heart Rhythm Notifications on both watches have FDA and EU clearance. Only in select countries, not for people under 22 or with known atrial fibrillation.","fast_charging":"Fast charging gets a full day's worth of battery in just 12 minutes."}},{"url":"https://support.google.com/googlehealth/answer/14226518?hl=en","kind":"manufacturer_page","accessed":"2026-10-23","fields":["battery_life_claimed"],"notes":{"battery_life_claimed":"Estimated battery life table: Fitbit Sense 2 6+ days. Footnote: with always-on display, Sense 2 has a battery life of up to 3 days (stored as 72 h always_on). The same footnote says Sense 2 has up to 12 hours with continuous GPS, which conflicts with the 5 hours on the model spec page. The 12 hour figure is not stored."}},{"url":"https://support.google.com/googlehealth/answer/14236725?hl=en","kind":"manufacturer_page","accessed":"2026-10-23","fields":["os_latest"],"notes":{"os_latest":"Fitbit firmware release notes: Sense 2 latest listed version 220.31 (bug fixes and improvements) on the access date. No Fitbit OS major version number is published."}},{"url":"https://support.google.com/product-documentation/answer/14815834","kind":"manufacturer_page","accessed":"2026-10-23","fields":["warranty_years"],"notes":{"warranty_years":"Fitbit Limited Warranty: new products carry one year from purchase, two years for EEA residents who bought in the EEA. Devices bought on or after July 11, 2023 fall under the Google Hardware Warranty Center terms. Stored as the US one-year term."}},{"url":"https://store.google.com/gb/magazine/google_pixel_watch_compare?hl=en-GB&toggler0=Fitbit+Sense+2&toggler1=Fitbit+Versa+4&toggler2=Google+Pixel+Watch+3+%2841mm%29","kind":"manufacturer_page","accessed":"2026-10-23","fields":["water_resistance_atm","fall_detection","crash_detection","emergency_sos","satellite_connectivity","led_flashlight"],"notes":{"water_resistance_atm":"Maker comparison, Water and dust resistance row: Sense 2 5 ATM.","fall_detection":"Safety and emergency rows (Safety Check, Emergency Sharing, Medical information, Fall Detection, Emergency SOS, Emergency international calling, Car Crash Detection, Earthquake Alerts): the Sense 2 column is empty for all of them. No fall detection.","crash_detection":"Same Safety rows: Car Crash Detection is empty in the Sense 2 column.","emergency_sos":"Same Safety rows: Emergency SOS is empty in the Sense 2 column.","satellite_connectivity":"No satellite feature in any Safety row. Published radios are Bluetooth and NFC. GPS reception is separate.","led_flashlight":"No flashlight appears in the Sense 2 sensor and component list. Gadgets & Wearables states Flashlight: No."}},{"url":"https://web.archive.org/web/20221022073607/https://www.fitbit.com/global/us/products/smartwatches/sense2","kind":"manufacturer_page","accessed":"2026-10-23","fields":["battery_life_claimed"],"notes":{"battery_life_claimed":"Archived Fitbit.com Sense 2 page, Oct 22, 2022: battery life of 6+ days and up to 5 hours with continuous GPS. Same wording as the current Google Store."}},{"url":"https://support.google.com/googlehealth/answer/14237924","kind":"manufacturer_page","accessed":"2026-10-23","fields":["fitness_features"],"notes":{"fitness_features":"Learn about your VO2 max: VO2 max, formerly the cardio fitness score, is estimated during outdoor runs with GPS. The Sense 2 manual names the cardio fitness score."}},{"url":"https://gadgetsandwearables.com/technical-specs/fitbit-sense-2/","kind":"spec_database","accessed":"2026-10-23","fields":["chipset","cpu_core_count","cpu_clusters","ram_gb","screen_size_in","resolution","brightness_peak_nits","compass","led_flashlight","offline_maps","offline_music","bioimpedance","blood_pressure","battery_capacity_mah"],"notes":{"chipset":"Platform: Ambiq Apollo4 Plus, ARM Cortex-M4 at 96-192 MHz. Fitbit publishes no chip and Notebookcheck says it does not disclose the SiP. Ambiq's own presentation says Apollo4 powers the Sense product line, which supports the chip family but not the Plus suffix.","cpu_core_count":"Same Platform entry: one ARM Cortex-M4 core.","cpu_clusters":"Same Platform entry: ARM Cortex-M4 at 96-192 MHz. 192 MHz is stored as the maximum.","ram_gb":"Same entry: 2.75 MB on-chip SRAM, stored as 0.00275 GB with 1000 MB per GB. No maker figure exists.","screen_size_in":"Display size 1.58 inch. Notebookcheck and nextpit state the same. Fitbit publishes no diagonal.","resolution":"Display resolution 336 x 336 pixels. Notebookcheck states the same.","brightness_peak_nits":"Display brightness: Up to 1,000 nits. Fitbit publishes no nit figure in the documents read, so this is a spec database claim. Window size and ambient conditions are not stated.","compass":"Compass: No. Geomagnetic: No.","led_flashlight":"Flashlight: No.","offline_maps":"Offline maps: No. The manual requires the phone and background app for Google Maps.","offline_music":"On-board music storage: No. Smartphone music control only.","bioimpedance":"Body composition: No.","blood_pressure":"Blood pressure: No. The maker sensor list and feature pages have no blood-pressure feature.","battery_capacity_mah":"Battery: rechargeable lithium-polymer battery, 162 mAh."}},{"url":"https://www.ifixit.com/products/fitbit-sense-2-battery","kind":"retailer","accessed":"2026-10-23","fields":["battery_capacity_mah"],"notes":{"battery_capacity_mah":"iFixit replacement battery listing for Sense 2: 0.62 Wh, 3.87 V, 162 mAh. 162 mAh x 3.87 V = 0.627 Wh, which agrees. It is a parts listing, not a teardown. Gadgets & Wearables, Notebookcheck and nextpit also state 162 mAh. Two Argos listings print 260 mAh, which is not used."}},{"url":"https://www.nextpit.de/smartwatches/google-fitbit-sense-2","kind":"spec_database","accessed":"2026-10-23","fields":["battery_capacity_mah","screen_size_in","launch_price_eur","bluetooth_version","case_shape","case_material"],"notes":{"battery_capacity_mah":"Batteriekapazität (Netto): 162 mAh.","screen_size_in":"Displaygröße: 1,58 Zoll.","launch_price_eur":"UVP 299,95 EUR, marketed from September 2022.","bluetooth_version":"Bluetooth: 5.","case_shape":"Gehäuseform: eckig (square).","case_material":"Gehäusematerial: Aluminium."}},{"url":"https://www.pcwelt.de/article/1206707/fitbit-sense-2-vorgestellt-hier-finden-sie-alle-infos.html","kind":"press","accessed":"2026-10-23","fields":["launch_price_eur"],"notes":{"launch_price_eur":"PC-Welt (Germany) at the launch: Die Fitbit Sense 2 kostet 299,95 Euro. German prices include VAT. Tech Advisor states EUR 299.95, GBP 269.99 and USD 299.95."}},{"url":"https://ambiq.com/wp-content/uploads/2022/12/Key-to-the-Future-of-Electronics.pdf","kind":"press","accessed":"2026-10-23","fields":["chipset"],"notes":{"chipset":"Ambiq presentation: Apollo4 powers Inspire, Versa and Sense product lines of Fitbit, and Versa 4, Sense 2 and Inspire 3 were launched in August 2022."}},{"url":"https://www.tomsguide.com/news/fitbit-sense-2","kind":"review_site","accessed":"2026-10-23","fields":["third_party_apps"],"notes":{"third_party_apps":"Review: you don't get access to third-party apps. You can download custom watch faces but not third-party apps. The Sense 2 and Versa 4 cannot."}},{"url":"https://www.notebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.html","kind":"measurement","accessed":"2026-10-23","fields":["refresh_rate_max_hz","storage_gb","band_width_mm","measured_battery_active_use_h","battery_life_measured","measured_charge_time_min"],"notes":{"refresh_rate_max_hz":"Notebookcheck spec box lists 60 Hz. Fitbit publishes no refresh rate. Treated as a stated spec, not a measurement.","storage_gb":"Performance and runtime: the manufacturer has installed 4 GB of internal storage, usable for apps and watch faces. Fitbit publishes no storage figure. Routes and music cannot be stored.","band_width_mm":"Case and features: the strap is 24 millimeters wide and can be changed without tools. It is not a standard clasp, so 24 mm is the strap width, not a lug width for standard straps.","measured_battery_active_use_h":"Battery life: with all measurements active, worn around the clock, automatic training detection on, no extensive workouts and the always-on display off, the Sense 2 lasts exactly six days (144 h). Firmware and brightness are not stated. The always-on display test (just under four days) has no exact figure and is not stored.","battery_life_measured":"Same test: always-on display off, all measurements active, automatic training detection, no extensive workouts. 6 days converted to 144 h. With the always-on display on it lasted just under four days, which is not stored as a number.","measured_charge_time_min":"Battery life: 0 to 99 percent after 85 minutes on a 24-watt power supply and another 10 minutes for the last percent. Stored as 95 minutes for 0 to 100 percent. 0 to 80 percent took one hour. Test unit with the supplied charging cable and a 24 W adapter. The maker claims two hours."}},{"url":"https://www.abt.com/Fitbit-Sense-2-Graphite-Aluminum-Shadow-Grey-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521BKGBUS/p/182315.html","kind":"retailer","accessed":"2026-10-23","fields":["gtins","model_numbers","variants"],"notes":{"gtins":"Abt lists FB521BKGB-US with UPC 810073611429 (Graphite Aluminum with Shadow Grey band).","model_numbers":"Abt lists manufacturer model FB521BKGB-US. FB521SRWT-US and FB521GLBM-US are on the sister Abt listings. FB521 is the model in the manual.","variants":"Abt US model FB521BKGB-US, UPC 810073611429, Graphite Aluminum with Shadow Grey band. Colours and models differ only in finish and strap colour."}},{"url":"https://www.abt.com/Fitbit-Sense-2-Platinum-Aluminum-Lunar-White-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521SRWTUS/p/182317.html","kind":"retailer","accessed":"2026-10-23","fields":["variants"],"notes":{"variants":"Abt US model FB521SRWT-US, UPC 810073611443, Platinum Aluminum with Lunar White band."}},{"url":"https://www.abt.com/Fitbit-Sense-2-Soft-Gold-Aluminum-Blue-Mist-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521GLBMUS/p/182316.html","kind":"retailer","accessed":"2026-10-23","fields":["variants"],"notes":{"variants":"Abt US model FB521GLBM-US, UPC 810073611436, Soft Gold Aluminum with Blue Mist band."}}],"fields_filled":105,"updated":"2026-10-23"},"meta":{"api_version":"1","docs":"https://arkivo.dev/api"}}