Let life be full of technology. Compared with most other portable neck-mounted fans, the neck-mounted radiator uses a smart chip to control the temperature, and uses the cooling principle of two pieces of aviation aluminum heat conduction fins. By cooling the neck and lowering the blood temperature, the blood circulates throughout the body to achieve the effect of cooling and heating the whole body, realizing true intelligence and wearability.Semiconductor peltier-thermoelectric moduleCooler efficiency:11 degree-16 degree lower than ambient temperature Refrigeration mode Low mode: lower down around 9-11 degree High mode: lower down around 16-18 degree Power supply mode USB cable to supply powerLow mode: Connect to the power supply. Attention Please do not cover the wind holes at the two side of the device, which will effect the cooling function.Operation Power on: Press the power/mode button compatible with around 1-2 seconds until the blue light is flashing.Low mode: when power on, the device enter into low mode.High mode: when the device is in low mode, press the power/mode button compatible with one timeto enter into the high mode and the blue light will be on.Low Noise Design and Comcompatible withtable: To avoid the noise caused by the internal motor, fan blades, and air ducts of the traditional hanging neck fan, the portable neck hanging fan use low noise design. It is almost zero noise, suitable to use in any scenes. According to the ergonomic design concept, using selected high-quality soft rubber, it is more comcompatible withtable to wear.material: plasticCOLOR: BlackPackage Contents:1 x cooler1 x USB cableOnly the above package content, other products are not included.Note: Light shooting 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.