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In recent years,more and more old people appear living alone which have a lot of things forgotten due to their bad memory.This has caused a lot of inconveniences to their lives,includes the most common case,keys forgotten.The special part of this small wall lamp is that a small hook which can sense gravity is attached on it .When the key hang up ,the lamp shines,when the key taken away,the lamp turns off .Old people can hang the stuff on the entrance when they return so that they can get the key again easily when they leave.By the way,it uses a very small quantity of energy and can be shut off with the switch on the wall whenever you want.