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