I needed wireless doorbells as I prepare my manufactured home for sale. I bought 2 transmitters and 1 receiver. They arrived the next day (yay Prime!). The transmitters and receiver were already paired, so all I had to do was decide where to plug in the receiver and pick the tone and volume. Installation of the transmitters was so easy, even I couldn't screw it up! In way under an hour I have a doorbell at my front and back doors. I can hear the "Ding Dong" throughout my home. My cats no longer run for cover when someone rings the doorbell. I just installed these today, so I can't speak to how long they will last.
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