different from other phone cooler or phone radiator, this product adopts semiconductor technology, the most efficient cooling technology. it is also the technology used in air conditioning..semiconductor heatsink can reach 18 degrees celsius, keeping your phone under 25-35 degrees celsius during long time operation,whether playing games or live streaming, this phone radiator provide the best heat dissipation, just like a mobile phone lying in a 20 degree celsius air conditioning room.universal for all kinds of smart phones, suitable for mobile phones from 4 to 7 inch in length. usb power supply separately.powerful heat sink: the cooling fan prevents the phone from overheating while playing the game console, extending the life of the phone and battery radiator: compared with other coolers, this radiator has a speed of 6000 and a large wind instantly takes away the heat of the mobile phone. it can effectively solve the problem of fever or power failure when using the mobile phone applicable to all models of for iphone / android phone / tablet with a thickness of about 2.16 inches. play a variety of games without worrying about fever the cooling radiator is powerful and equipped with a 2m usb data cable. plug in the power to automatically turn on, and instantly cool light weight and convenient, silicone mat on the edge of the cooler firmly absorb the phone to avoid the phone falling off and scratching