Eye protector technology. Made of high-end soft and comfortable PU leather. PU leather is fully perforated to achieve effective ventilationand cool dissipatio effect. With efficient exhaust fan,the eye air circulation, to achievea long time use of eye comfortable environment. Input interface: TYPE-C Input voltage 5V±0.15V Input current: ≥ 500 ma Fan three speed: stop, medium speed, high speed Battery charging in the red light, full of red light off Battery charging current: 200ma High-speed fan ice blue light is on high, medium-speed ice blue light is on, blue light is off when the fan is turned off Instructions for use: 1. 3-speed fan speed control Each time you flip the switch, the fan speed changes once. Fan OFF speed, medium speed, full speed. When the battery is low it affect the fan speed at high speed. When the battery is seriously low, the full speed may be about the same as the medium speed until finally the fan stops. 2. When the battery is charging the red LED lights up,