text: It's a good thing the battery on this unit is replaceable because the one I got was dead on arrival. I got this for my son as a gift and he had given up on it as junk before we finally got a replacement battery from the store and bingo - came right to life. He's enjoying it now. It was quite easy to set up and the volume on the device seems good. He's been able to find his keys upstairs while signaling from downstairs. We've probably only tested it at a range of about 75 feet so I can't vouch for the range claims. Just be aware that you may need to do a battery swap to get the thing working.