General Info and Specifications

Sensors and Components

Fitbit Sense contains the following sensors and motors:

  • Multi-path optical heart rate tracker
  • Multipurpose electrical sensors compatible with the ECG app and EDA Scan app
  • Gyroscope
  • Altimeter, which tracks altitude changes
  • 3-axis accelerometer, which tracks motion patterns
  • On-wrist skin temperature sensor
  • Ambient light sensor
  • Built-in GPS receiver + GLONASS, which tracks your location during a workout
  • Vibration motor
  • Speaker
  • Microphone


The band that comes with Sense is made of a flexible, durable elastomer material similar to that used in many sports watches.

The housing and buckle on Sense are made of anodized aluminum. While anodized aluminum can contain traces of nickel, which can cause an allergic reaction in someone with nickel sensitivity, the amount of nickel in all Fitbit products meets the European Union's stringent Nickel Directive.

Our products may contain trace amounts of acrylates and methacrylates from adhesives used in those products but we work to ensure our products adhere to rigorous design specifications and meet extensive test requirements so as to minimum the potential for reaction to these adhesives.

Wireless technology

Sense contains a Bluetooth 5.0 radio transceiver, Wi-Fi chip, and NFC chip.

Haptic feedback

Sense contains a vibration motor for alarms, goals, notifications, reminders, and apps.


Sense contains a rechargeable lithium-polymer battery.


Sense stores your data, including daily stats, sleep information, and exercise history, for 7 days. See your historical data in the Fitbit app.


Sense has a color AMOLED display.

Band size

Band sizes are shown below. Note that accessory bands sold separately may vary slightly.

Small band Fits a wrist between 5.5 - 7.1 inches (140 mm - 180 mm) in circumference
Large band Fits a wrist between 7.1 - 8.7 inches (180 mm - 220 mm) in circumference

Environmental conditions

Operating temperature

14° to 113° F
(-10° to 45° C)

Non-operating temperature

-4° to 14° F
(-20° to -10° C)

113° to 140°F
(45° to 60° C)

Charging temperature 32° to 95° F
(0° to 35° C)
Water resistance Water resistant up to 50 meters
Humidity range While Fitbit Sense can operate in humidity conditions between 0% and 100%, we recommend not operating in conditions over 60% for prolonged periods of time.
Maximum operating altitude 28,000 feet
(8,534 m)

Learn more

To learn more about your watch, how to track your progress in the Fitbit app, and how to build healthy habits with Fitbit Premium, visit

Return policy and warranty

Find warranty information and the return policy on our website.