My husband is hard of hearing and he could not hear the doorbell ringing. This doorbell system is exceptional. I was able to buy additional transmitters to plug in on the main and second floor. They are very easy to use. Just plug them in. It was a little annoying to sync them to the identical chime, but I figured it out. It also flashes while it rings which is great for a person with hearing loss. It has really solved the problem.
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