Works great

Got this for my dad for his birthday since he always loses his keys. He's been using it for about a month and a half and so far so good! It really does work through walls and from floor to floor.  The key fobs are pretty unobtrusive so they fit well with other keys and things on a key chain. All in all, I would say it's a good deal for the price.

Handy

After having lost my set of keys (again) I finally got smart and ordered this product.  It came beautifully packaged so it was super easy to get everything tagged and in service.  I already find myself using it to locate keys and phone and wallet.  It works exactly as stated and the $16 price is a fantastic option to the hundreds of dollars that it takes to replace a phone or security car keys.

This works as it should. I purchased it to attach to my Amazon fire remote. That thing is so small that I am constantly losing it. These little fobs are a little big for that. Are they usable? Sure! Just a bit big and in the way. I got used to it. It beats searching for the remote every day. I will likely put a key chain loop on one and make it so that I can hook it to my phone some how when I'm home (which is where I usually lose my phone- thanks kids!) These are too big to use on my phone all of the time. Perfect size for keys. I have terrible hearing but I'm able to find these every time. Great product.

Does the job although a bulky addition to your key ring.  The advertised "up to 30 meter range" is a tad optimistic.  I've found that 15 meters is about all you can expect in a house (intervening walls, etc) -- or, practically, just how far you can really hear the sound.  Customer service is excellent.

The parts that attach to key rings are, well... kinda big. That may be due to the size of the battery, but still.... And when those batteries die, I'm sure that no amount of listening will hear a silent (non-existent) ring. The bottom line (mine, at least) is that the device is great until, at some point in the future, it's not.

Works good enough that we bought a 2nd one. Range is good even inside. May be difficult to located something outside if it is on the ground and far away.

This works awesome. The Amazon Fire TV remote is so small that the kids lost it nearly every day. A quick press and I can find it quickly.

Last week I lost my $100 + dollar Nissan spare key, then found days later in a bag in the basement after looking hard.. When I saw this, I ordered based on the customer reviews and immediately tested once it was delivered. Worked perfectly, as long as the receiver is in range. For the price, this is well worth the possibility of losing my expensive key again. I'm unsure of the battery life, but replacement batteries are cheap. I immediately niter the alarm speaker is on the backside of the receiver. When I flipped it over it sounded much louder. Overall very worth having for the price, as I misplace my keys in the home a lot. 4.5 stars because it does not connect to a smartphone.