Set your phone down in the QI wireless charger to start charging. It charges two mobile phones and 1 watch at a time or one phone, one watch or one airport at a time. It is compatible with QI enabled device very swiftly and conveniently. When the battery is charged fully, it will automatically go to sleep and the phone will last longer. The charger has an anti-skid pad that effectively avoids sliding due to the non-slip mat present in the bottom of it. The device will stop charging when foreign objects are detected such as keys, coins, knives, scissors, etc. It has a cooling hole design and the device starts over-heating protection when the temperature is too high.