I've had this unit for a little less than a year. I also bought one for an out of state friend who also cares for his mom. I am also a guardian for my mother. My friend had an unresponsive block about 3-4 months ago. Not because of battery or other obvious reasons. Today one of my devices stopped working. Not because of the battery either. In fact, you can still choose the ringtone you want. He just doesn't respond to the beeper on his mother's necklace. Our other receiver is still receiving and working. But for the price they were very useful. They're loud when you need it. To date, the device has been able to receive transmissions down in the basement with the door closed. I'm looking for a replacement receiver. In my opinion, the receiver also drains the batteries quite quickly. Requires three AAA batteries. So I just stock a lot, like a bag from Costco. I used to have another brand that I couldn't find anymore that cost at least three times as much and only had one receiver. This was better because the transmitter part wasn't as big and chunky as it was smaller and rounder. But he only had one receiver, and he didn't have a choice about the sound he made. So all in all, if you need to replace any of these, it's probably a worthwhile investment and cheap. After taking a closer look at the site that sells this, I found that there are instructions on how to re-pair! So I'll try that in the morning and then update.
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