Features: design: We provide a ring, first you paste it on the back of the phone/tablet, and then you can firmly attach the cooling fan to the phone, which is very easy to use. Quickly cool down the phone: Use the phone/tablet for a long in summer, especially when using the phone/tablet to watch videos and for play games, it is very easy to get hot, which affects the life of the phone. This phone radiator is born to solve the heat of the phone of. Small and easy to carry: It can be carried in a pocket or backpack at any , and it is convenient to carry out. USB power supply: the cooling fan adopts USB power supply, mobile power supply, notebook computer, USB adapter, can all supply power to the fan, so you 'for t delay playing games or watching videos. Strong compatibility: The fan has a side length of about 50mm and a height of about 10mm, which is suitable for almost all for smart phones and tablets. Color: As Shown Material: plastic Package Contents: 1 x cooling fan 1 x ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.