The , AVANTEK D-3F Wireless Doorbell Chime Kit is great! It is small in overall size and thin, so you don't have a big ugly box on the wall. They give you what is need to attach the doorbell unit by whichever door you choose - took maybe 5 minutes, because I cleaned the area first. I have a two story 4280 sf home (only mentioning size for the purpose of how far you can hear) you can hear the door bell in every room. There are multiple chimes you can pick, from dogs barking to something simple. I would recommend this unit!
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