The Stone - A Button To Find Your Phone, Text Eta, Emergency Call and Control Your Camera - Cascade The stone is a shortcut to your phone and other smart devices Text ETA, make calls, take pictures and find your phone with the press of a button Can receive alerts from it's motion sensor, temperature gage and range finder Replaceable battery, water resistant and crowd GPS if it gets lost Compatible with iOS 9.0 or android 5.0 or later