Yoo Bluetooth Smart Activity Tracker Bluetooth Smart wireless activity tracker Tracks minutes moved, daily steps, distance and calories-burned LEDs display step count when waved in the air 6+ month battery life Lithium Ion CR2032 battery included Bluetooth(r) Smart Wireless Activity Tracker Tracks Minutes Moved, Daily Steps, Distance & Calories-burned Leds Light Up To Track Progress Leds Display Step Count When Waved In The Air Smart Clip Attached To Shoes & Clothing Or Slip Into A Pocket Or Bra For Portable Convenience