Yoo Mini Wireless Activity Tracker, Easy Clip on! Small, easy-to-use wireless activity tracker that's as big as a quarter;Easily track daily steps, distance, and calories burned; Features a special built-in point system that works in conjunction with the Yoo Fitness app for added motivation;Includes the special LED Air Show Display that helps you track your daily steps instantly;To see your steps, simply wave your Yoo in the air and your steps will be displayed instantly Comes with a clip so you can attach Yoo to your shoe or belt, or simply slip it into your pocket; Water-resistant design means you can use it rain or shine without worry; Operates using a replaceable lithium ion battery that provides a battery life of up to 12 months without having to recharge; Yoo syncs wirelessly with your device and is compatible with iOS devices including the iPhone 4S and later, iPad 3 and Air, and iTouch Includes:Tracker;Clip;Battery; Instructions Specifications:Tracker Color: Black;Clip Color: Blue; Compatibility: iOS Devices including iPhone 4S, 5C, 5S, 6, and 6 Plus, iPad 3, iPad Air, iTouch;Tracks: Steps, Distance, Calories;Display: LED (Wave to activate); Power Source: Replaceable Lithium Ion CR2032 battery (included);Battery Life: 12+ months (Approx);Weight: 0.5 oz. Note: Battery is included, but not guaranteed.