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KF(which is short for key friend) is specially designed for persons who do not have
good-sight, and those elderly who often forget to withdraw keys after opening door.
When users can not view lockhole in darkness and also can not feel where the lock hole locates accurately, he/she can have the aid of KF as an assistant tool.Just pressing round leather buttons bythumb and forefinger, two flashlamps at top face will be on to light. When users forget to withdraw key from lock hole, it will generate buzz voice to
wake them to take away. KF can hold diversities of “key holdings” inside its body, no
matter round or hexagon, metal or plastic.
Zheng zhou, China