Number of Batteries: 1 Features: Pedometer, Stopwatch, Caller Id, App Notifications, Smartphone Compatible, App Download Required, Receives Texts, Receives E-Mail, Alarm, Date Function, Water Resistant, Multi-Function, Touch Screen Enabled, Receives Calls, Customizable Watch Faces, Sleep Tracker, Bluetooth Compatible, Gps, Heart Rate Monitor, Adjustable, Rechargeable, Light-Up, Quick Ship Battery Type: Rechargeable Jewelry Closure: Buckle Power Source: Battery (included) Tech Compatibility: Apple Ios, Android Tracking Capability: Time, Sleep Quality, Hours Slept, Calories Burned, Steps, Distance, Heart Rate, Activity Tracking, Floors Climbed Watch Movement: Smart Watch Water Resistance: 10m Band Color: Black Dial Color: Black Metal Color: Silver Tone Case Thickness: 12.2mm Case Width: 43.2mm Watch Band Length: 9 3/4 Inch Band Content: Silicone Case Materials: 100% Metal Alloy Band Width: 20mm 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.