Fitbit Inspire 2  Black activity Tracker with Lunar White wrist band.

Classic Wrist band Lunar White (Both small and Large) 

Compatible charging cable for device. 

Sensors & Components

• 3-axis accelerometer
• Optical heart rate monitor
• Vibration motor

Screen

• 35.5mm OLED display
• 126 x 36 px
• Touchscreen

Battery & Power

• Battery life: Up to 10 days
• Battery type: Lithium-polymer
• Charge time (0-100%): Two hours
• Radio transceiver: Bluetooth® 5.0

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 meters.
• 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

• The Inspire 2 band is made of a premium, comfortable silicone (similar to that used in many sport watches) and fastens with a plastic buckle and tang.

Environmental Requirements

• Operating temperature: -10° to 45° C
• Maximum operating altitude: 28,000 ft

Syncing

• Apple iOS 12.2 or higher.
• Syncing range: Up to 30ft
• Certain features like smartphone notifications may require Android 7.0+.
• Syncing requires Bluetooth® LE and internet connection.
• Syncs with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later.

Watch size

• Small: Fits wrist 140 mm - 180 mm in circumference
• Large: Fits wrist 180 mm - 220 mm in circumference
• Watch screen size: 35.5mm

Dimensions

• 3.7cm (L) x 1.68cm (W) x 1.29cm (H)