Peak high-quality fitness bracelet. The bracelet is comfortable to wear both day and night. The BT 4.1 module accurately measures sleep, number of steps, calorie consumption and heart rate. It also includes functions such as taking pictures remotely or setting an alarm. The duration of a single charge is about 5 days. The bracelet is used with a special Swiss Peak app that can be downloaded from the Google Play or App Store. Compatible with iOS 7.1 or higher, Android 4.3 or higher.