Number of Batteries: 1 Features: Pedometer, App Notifications, Stopwatch, Heart Rate Monitor, Water Resistant, Bluetooth Compatible, Alarm, Rechargeable, Quick Ship Battery Type: Rechargeable Jewelry Closure: Buckle Power Source: Battery (included) Tech Compatibility: Apple Ios, Android Tracking Capability: Activity Tracking, Calories Burned, Heart Rate, Steps Watch Movement: Smart Watch Band Color: Black Dial Color: Black Case Thickness: 12.7mm Case Width: 23.2mm Watch Band Length: 9 1/2 Inch Band Content: Silicone Case Materials: 100% Plastic Band Width: 18mm Care: Wipe Clean Country of Origin: Imported Quick Ship items ship directly from the manufacturer within 3 to 5 business days. Photos are enlarged to show detail.