moov NOW Smart Activity Tracker Aids you in tracking the activities and its results Attaches to your wrist for absolute wearing comfort during long work sessions Features accelerometer for measuring the acceleration of a moving or vibrating body Restore mental alertness with a power nap feature Send and receive data from other Bluetooth enabled devices wirelessly via integrated Bluetooth Built-in battery that gives about 73 hour run time Durable water resistant casing ensures secure usage when dealing with water