Cambond's wireless doorbell kit has 2 receivers & 500-ft. range: $15 Prime shipped

Cambond (99% positive feedback lifetime) via Amazon offers its Wireless Waterproof Battery-operating Doorbell Kit with 2 Receivers for $14.99 Prime shipped when you use code 6JKZH7U7 at checkout. Normally $23, this is a match for its all-time low and the best available. Perfect if you have two ends of the house you want to be able to hear the doorbell in. Rated 4.5/5 stars.

500ft / 150m Long Wireless Range, and the doorbell with two receivers to ensure never missing a visitor when you are in the upstairs or another room, Products have been paired in factory, you can also add transmitters or receivers depending on your need
58 Different Ringtones available, 4 volume levels from 25-85dB, and 4 models of sound and LED flash (1, Ringing + LED Flash 2, Ringing only 3, LED Flash only 4, Ringing + LED all the time (like a night light), LED indicator of the doorbell for hearing impaired person
High Performance Push Button Transmitter, IP44 waterproof doorbell transmitter can be used outside in rain or shine, working temperature from -4 to 140 degree Fahrenheit and the battery in the transmitter has a 3-year lifespan

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Cambond’s wireless doorbell kit has 2 receivers & 500-ft. range: $15 Prime shipped