Key usage instructions: Cooling gear adjustment: Plug in the power and start cooling, with the minimum cooling gear, Pressing the+button for the first time indicates moderate cooling, and pressing the+button again for the second time indicates extreme cooling Cold mode cooling, the of the - sign to decrease to medium cooling, and then and hold the minimum cooling button once to turn off the device. Product parameters: Product name: Dual cooling semiconductor heat sink (live streaming back clip version) Product model: SL-22 Product weight: 88 grams Product size: 90x60x22mm Product power supply: 5V/2A Colour: black Material: ABS Package Contents: 1*Mobile phone radiator 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.