Knock Knock Door Chime

The Knock Knock Door Chime is great fun if your front door doesn’t have a doorbell and none of your friends have strong enough knuckles to make sure their knocking is heard when you’re way at the back of the house.
“No Doorbell? No Problem! Knock-Knock Door Chime automatically alerts you when someone is knocking at your door.”
Via Gizmodo.
Technorati Tags: doorbell, knocking

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