Some work and some don't
The main "finder" unit seems sturdy enough with a clip to holster somewhere as needed. The key chain units also seem fairly sturdy and respond well at ranges up to 15 to 20 feet. The sound is a bit low at range if in a jacket or something but since you'd be looking for the key chain you can easily hear it when you get closer. The other units (supposedly for phones or wallets or purses) is very bulky and it seems a bit flimsy. The double sided tape that is included is about 1/8 of an inch thick making the unit even bulkier. at least one of the "flat" units mal-functioned at onset beeping at random intervals with no rhyme or reason and finally I had to take the battery out to shut it up. The other unit works ok, but the range is strangely limited to about 3 to 6 feet. It does come with a battery for each unit 4 watch batteries for the key chains and the "flat" units and a battery for the finder. Perhaps I got a slightly faulty batch, but it is what it is and I can only speak on my experience with the product.
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