Unopened box contains: *Fitbit Inspire 3 *Classic wristband (both small & large) *Charging cable Dimensions and weight: Length: 1.55 in (39.32 mm) Width: 0.73 in (18.6 mm) Height: 0.46 in (11.75 mm) Weight: 0.039 lb (17.69 g) Battery & Power: Battery life of up to 10 days. Battery type: Lithium-polymer Charge time (0-100%): Two hours Radio transceiver: Bluetooth® Memory: *Saves 7 days of detailed motion data, minute by minute *Saves daily totals for past 30 days *Stores heart rate data at 1-second intervals during exercise tracking and at 5-second intervals all other times Environmental requirements: Operating temperature: 32° to 104°F Maximum operating altitude: 28,000 ft Sensors and components: 3-axis accelerometer Optical heart rate monitor Vibration motor Red and infrared sensors for blood oxygen (SpO2) monitoring. Display: AMOLED display Corning® Gorilla® Glass 3 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 3 band is made of a premium, comfortable silicone (similar to that used in many sport watches) and fastens with a plastic buckle and tang. Band size: Both small and large sizes included in box. Small: Fits wrist 5.1" - 7.5" in circumference Large: Fits wrist 6.3" - 8.7" in circumference