Number of Batteries: 1 Features: Digital Display, Pedometer, Sleep Tracker, Rechargeable, Receives E-Mail, Vibration Alert, Stopwatch, Heart Rate Monitor, Customizable Watch Faces, On Watch Workout, Date Function, Receives Calls, App Notifications, Alarm, Receives Texts, Quick Ship Battery Type: Lithium Ion Jewelry Closure: Buckle Power Source: Battery (included) Tech Compatibility: Apple Ios, Android Tracking Capability: Hours Slept, Steps, Activity Tracking, Heart Rate, Time, Calories Burned, Distance Watch Movement: Smart Watch Band Color: Black Dial Color: Multi-Color Metal Color: Rose Tone Case Thickness: 12mm Case Width: 40mm 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.