Number of Batteries: 1 Features: Receives Texts, App Notifications, Pedometer, Rechargeable, Vibration Alert, Alarm, Digital Display, Receives Calls, Sleep Tracker, On Watch Workout, Date Function, Customizable Watch Faces, Stopwatch, Heart Rate Monitor, Receives E-Mail, Quick Ship Battery Type: Lithium Ion Jewelry Closure: Buckle Power Source: Battery (included) Tech Compatibility: Android, Apple Ios Tracking Capability: Distance, Calories Burned, Steps, Hours Slept, Activity Tracking, Time, Heart Rate Watch Movement: Smart Watch Band Color: Black Dial Color: Multi-Color Metal Color: Black Case Thickness: 12mm Case Width: 42mm Watch Band Length: 9 1/2 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.