What's included:

• Fitbit Sense
• Classic wristband (both small & large)
• Charging cable

Sensors & Components

• Multi-path optical heart rate sensor
• Multipurpose electrical sensors compatible with EDA Scan app
• Red and infrared sensors for oxygen saturation (SpO2) monitoring
• Gyroscope
• Altimeter
• 3-axis accelerometer
• Skin temperature sensor
• Ambient light sensor
• Wi-Fi (802.11b/g/n 2.4GHz)
• NFC
• Built-in GPS + GLONASS
• Vibration motor
• Speaker (75dB SPL @10cm)
• Microphone

Battery & Power

• Battery type: Lithium-polymer
• Charge time: (10-80%): Approximately 40 minutes
• Fast charging: 1 day of battery life in 12 minutes
• Radio transceiver: Bluetooth® 

Memory

• Saves 7 days of detailed motion data, minute by minute
• Saves daily totals for the last 30 days
• Stores heart rate data at one-second intervals during exercise tracking and at five-second intervals all other times

Water-Resistance

Water-resistant to 50 metres. After getting the band wet, we recommend drying the band because, as with any wearable device, it's best for your skin if the band is clean and dry. 

Materials

This watch includes a band made of a flexible material similar to that used in many sports watches, as well as an aluminium watch case and buckle.

Heart Rate

Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.

Environmental Requirements

• Operating temperature: -10° to 45°C
• Maximum operating altitude: 8,535 m

Color: Sage Grey, Carbon, Lunar White