Practical. You can easily find the keys. Shortly before the keychain's battery runs out, it notifies you with a red light.

Amazing invention, it has saved me countless times when the keys are simply not in their place and I have stuffed them in bags, jackets, the closet, etc. I remove one star because I would like it to beep even louder, and also the receivers drain the battery very quickly. About every month it needs changing, even with no use at all.

This is the second set we are buying. It is fine for the money. It does its job! I don't give it 4 stars because after two years of use it broke, but that's okay.

I am very satisfied that I bought a second one and also gave it as a gift. I had tried some other ones with a whistle, looking to find one that I had many years ago and liked, but no comparison, today's are useless. This one here is excellent, it works with RF (passes through obstacles and walls by simply pressing a button) at a satisfactory distance (tested up to 30m).

The second one I bought for the countryside in the fields as I lost my car keys and they were found

It does what it says. The sound is satisfactorily powerful (maybe it could use a little more), convenient minimalist design (it doesn't bother you on the keychain), decent range (usually doesn't respond beyond 20m). It has already saved me 2-3 times, so I will say that it is worth its money.

It is the second one I bought (the first one lasted 4 years despite the mishandling). The battery in the keychain lasts about 1 year.

It works fine. Finally, we find the keys. Ideal for adults who have some kind of boredom.

Very useful tool especially for the elderly who forget. The only negative thing I would characterize is that if you leave the receiver with the hole where the sound comes out from below, it sounds very quietly. However, it is worth its money.