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It took me a while to figure out how to turn it on. The batteries were included as stated but it didn’t initially appear that way. The “on” position is midway on the toggle bar. Once I had it working I found it to be unreliable. It usually responds to a whistle but never a clap. It also goes off when the dog barks which makes him bark even more. I currently have it turned off and I’m not sure if I’ll try to use it again. Maybe I’ll try to figure out how to make it useful.

It came to me very well, precious, whistle in a whistle, but it doesn't work anymore, I would like someone to tell me if I have to put a battery there or something, because if it stops working in a month, I do not recommend it. I hope someone informs me. It has been downloaded and I don't know how to load it, mine didn't come with any accessories to do it, and the time it rang, I'm delighted, but it's been quiet for a long time.

It is enough that the person is a little hard of hearing not to find his keys anymore, here is the ringtone and too weak at 5 meters you do not hear the ringtone, between us, a nice scam, yes you have fooled me, but it's the game I think that at amazon it should be more reliable, but I regret the purchase 2000%

It is a keychain that allows us to find our keys by means of a whistle, as I show in the video, it emits a beep that goes in ascending sound that will make it easier for us to find them and it even has a button in case we are left in the dark that helps us open the door with a little red light.