Band Length: Both small and large sizes included in box.
Small: Fits wrist 5.1 - 7 inches in circumference
Large: Fits wrist 6.5 - 8.6 inches in circumference
APP Compatibility: Made for: iPod touch (3rd and 4th generation), iPhone 4S, iPhone 4, iPhone 3GS, iPad 2, iPad (iOS 5.1 or higher required) Smartphones with Android 0S (Gingerbread 2.3.3 & higher),Tablets with Android 0S (Honeycomb 3.0 & higher)
Specification: Managing pulse, calories burned, distance, speed, pace, music and more.
Accurately monitor your intensity level.
Lightweight and comfortable armband
Control music from the armband
Rechargeable battery, up to 6 hours of workout time
Wirelessly workout from up to 33 ft away from your device