This is the fitness wristband that monitors heart rate, tracks daily activity, and records sleep cycles. While the device’s accelerometer tracks steps taken and distance traveled, the built-in ECG measures heart rate to more accurately calculate exercise intensity and calories burned. Comfortable and unobtrusive, it also tracks how long it takes one to fall asleep, time spent in REM, and the level of sleep quality. The hi-resolution touchscreen delivers a crisp, clear visual readout and also offers a variety of faces from which to choose. Statistics are synced wirelessly to an app compatible with Android, Apple iOS, and Windows devices. The wearer also has the option to set alarms, listen to music from a mobile playlist, and receive smart notifications. Made of elastomer with surgical-grade stainless-steel frame, the device is sweat-and-water resistant. Operates for up to seven days on a full charge. Black. Large (6.7"-8.1" wrist diameter) or Small (5.5"-6.7").