1Sale offers ($5) Closeout - Wireless Doorbell for $4.91 (orig. $49.99)

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The Wireless Electronic Doorbell With Light Up Alert is the easiest doorbell to install because it needs no complicated tools, wiring, or programming. And since it doesn't need any electricity, you can put it anywhere up to 150 feet away from the base. It works just like a normal wired doorbell and even has the two most popular doorbell tones; ding dong or the Westminister chime.