Fitgo Prime (Slate) High Quality German TPU band with multiple colors to chose from. Comfortable and stylish. Waterproof grade IP67, Compatible with most smart phones, Bluetooth 4.0 or above, Andriod 4.3 or above, Iphone 4s or above, IOS7.0 or above Touchscreen! Multiple functions include Pedometer, Distance tracker, Sleep tracker and Calories Burned. Sedentary alarm can be set to remind you to keep moving. FIND YOUR PHONE FUNCTION! Never lose your phone again. Just press the button on your FitGo Touchscreen and 3 loud beeps will sound from your phone to help you locate it! Download FitGo APP from APP store to track and chart your progress. Documents 1 years worth of data including daily charts of calories burned, steps taken, distance walked and sleep quality. Incoming call notification, (caller ID if using Andriod) Message notification, Remotely take pictures, play music AND its good for swimming.