I bought the Chipolo One Bluetooth Tracker in black color at least a month ago and I put it on my car keys. So, I have to say the following: a) It is very useful because you never know when you will forget your keys. Or in the worst case, when you will lose them. b) When you move away from your chipolo, it reminds you that you forgot them (the keys) with a warning sound on your android (distance approximately 60m to 70m). If you lose them (the keys) again, you simply find them through the app, which is very easy and simple to use. c) Many times, I don't remember where I put my phone at home. I press the chipolo twice and my android makes a nice sound and I find it (the sound intensity increases). d) It has never disconnected from me. e) It also works as a remote control for selfies. P.S. It came to me with completely empty battery and that bothered me a little because I thought I was doing something wrong and couldn't connect the chipolo to my android. Of course, this is the fault of the company I bought it from, but anyway, I put another battery and everything is fine.

I bought a pack of 4 pieces.
The basics you need to know:
- Press on your phone to find the keys and the keychain makes a sound
- Press the keychain and the phone makes a sound.
- It notifies you if you forget your keys behind when leaving.
- It keeps the last position of the keys (before disconnecting from your phone) so you can go back and find them.

If it disconnects due to distance from the keys, press on the application that you lost the keys and supposedly if someone passes by with a similar keychain, they will receive a signal from it and show you on the map where they are. (I haven't tried this yet).

It says about 2 years of battery life. We'll see.

Bluetooth and GPS must be constantly on for it to work. So-so. 1-2 times I needed to find my keys, it didn't connect though.

The sound detection is very useful, which many other trackers do not have. I bought the 4-pack for various uses.

I bought 1 piece a year ago. Since I had never used a similar device before, I had no point of comparison. What I can say with certainty is that it has saved me to such an extent that I bought 2 more and my forgetful friends, who are also satisfied, did the same. Also, none of us who bought it have an iPhone and it works perfectly fine. Those who comment that it is only for Apple are obviously referring to the Cipolo One Spot, which is another product designed for Apple.

Small and lightweight. It has good range (how far you can be from the tracker and still be able to ring it) and a loud ringtone. The battery, unlike some competitive products, can be replaced. It is combined with a very functional and user-friendly free mobile application (Android in my case - also available for iPhone). Through the application, you can make the tracker ring to locate it, see where the tracker was approximately the last time your mobile "saw" it, and be notified if your mobile loses contact with the tracker due to a long distance (out of range alerts - for example, if you leave somewhere and take your mobile with you but forget your keys behind). Similarly, through the tracker, you can make your mobile ring to locate it (in my case, even if it is in silent mode).