We have a wireless doorbell. It's audible anywhere inside the house. I love that we can change the tune too. We changed it to Westminster. But you could even do Take Me Out To The Ballgame if you wanted, by pulling a tiny little black clamp off the chip and moving it to the corresponding point, that matched up to a chart on the back of the chime's face.
Uses I believe 3 D batteries (maybe just 2, would have to check when I get back to the house).
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