Materials

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.

Battery

Sense contains a rechargeable lithium-polymer battery.

Memory

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

Display

Sense has a color AMOLED display.

Band size

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