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It is a lighting keyhole to help plug key into the hole by receiving infrared beam emitted by supporting key.This keyhole has a slideway on top.Press the button sideward the supporting key,a string of infrared signal will project on lighting leading light.After receiving the signal,the leading light will glisten, and meanwhile the slideway will assist in plugging in key.It is convenient for people who have to open doors with a dim light source or even without light.Lighting circle will not radiate light unless be irradiated by infrared beam.The press button is installed on the side of the key so as to press when unlocking door.
Guangmei Yang Jing Yang Ruowen Wu