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Sometimes it is difficult to find the lock hole in the evening or the light is not so strong, so we must use one hand to hold the light source and using another hand to open the door, it is not convenient. This kind of design is going to put an LED light in the plastic material shell which is equipped in the top of the key, so the lock hole could be found easily, LED has electric power source by button cell, and switching key can connect or cut of the electricity.
He Sun,Shengbing Qi,Nanxuan Liu,Wen Lan