I ordered the orbit key chain and set it up for my technophobic parent who keeps losing stuff. I found it very easy to set up, but they may have struggled, so I did it for them to save the hassle. Once set up it is VERY easy to use, and they had no trouble understanding how it worked. The only reason I'm not giving it a full 5 stars is because my parent has high frequency hearing loss, and absolutely can not hear the alert unless it's held right up against their ear and even then it's faint for them. This was the case for all 3 of the ringtones the device can sound. I can hear the ringtones clearly from the opposite side of the backyard, or another room in the house, but they can't hear it AT ALL. I think some of the reviews (not on Amazon, but elsewhere) complaining that it is not "loud" enough are actually struggling with hearing the specific frequency. For people with high frequency hearing loss, it seems to be kind of like that "mosquito ringtone" that was popular a few years ago because teenagers could hear it but their teachers couldn't. My parent can still use the device/app by checking the map to make sure the orbit is nearby, and then using the map and the green signal strength ring displayed in the app to see if they're getting closer or farther from the orbit. The fact that the orbit flashes also helps, as once you get close you can see the blue flashing light if it is dark enough outside/in the room. Alternatively, they can just ask someone with unimpaired hearing to track down the missing orbit because it works fine for us!
Update 9/17/18: Like many reviewers have written, the initial battery died right away, after about a week or two. That's ok, because it comes with a replacement, so if the replacement lasts the full 6 months it is supposed to then we'll still be happy. My parent hasn't noticed the phone battery needing charging more often because the app is always on, which some other reviewers complained about.
Update 1/18/19: The second battery didn't last either, so the unit itself was defective. We exchanged for a new one which has been going strong for 4 months now with no battery issues.
Orbit Bluetooth tracker helps you locate your keys, phone, or anything else you can attach it to. Using the free Orbit app, you can make your Orbit ring to locate it. If your Orbit is out of range (100ft) check the in-app map for Orbit's last known location. Have your Orbit but not your phone? Press the Orbit's button and your phone will ring, even on silent. Use your Orbit tracker as a selfie remote; you can now take the perfect selfies or group shot. The Orbit app is free to download from the App Store or Google Play. Orbit works with iPhone 4s and later, or Android 4.4 and above. The Orbit is waterproof and comes with a replacement battery.