Check the power switch, the switch can be normally turned; check the LED lamp cover, the lamp cover is clean and transparent, and the surface is flush with the surface of the housing; generally the force is pressed against the lamp cover, and the lamp cover is not sunken. 检查电源开关,开关能正常拨动;检查LED灯罩,灯罩干净透明,且表面与壳体表面平齐;一般力度按压灯罩,灯罩无下陷。