Number of Batteries: 1 Features: Smartphone Compatible, App Notifications, Receives Calls, Touch Screen Enabled, Batteries Included, On Watch Workout, Stopwatch, Customizable Watch Faces, Backlight Display, Wear Resistant, App Download Required, Alarm, Receives Texts, Sleep Tracker, Bluetooth Compatible, Heart Rate Monitor, Date Function, Rechargeable, Quick Ship Battery Type: Rechargeable Jewelry Closure: Buckle Power Source: Battery (included) Tech Compatibility: Android, Apple Ios Tracking Capability: Steps, Activity Tracking, Distance, Heart Rate, Calories Burned Watch Movement: Smart Watch Band Color: Black Dial Color: Multi-Color Metal Color: Black Case Thickness: 10mm Case Width: 34.1mm 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.