TrackR bravo Item Tracker: Simply attach this item tracker to your keys, cell phone or wallet to easily locate lost items in the TrackR app (download required). The tracker uses Bluetooth 4.0 to connect to your compatible mobile device with a wireless range of up to 80'. Find out-of-range items when other users walk by.
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It works but is very limited. First the sound produced by this device is useless, it is such a low volume you have to be within two feet to hear it. The separation feature works by sounding the tone from the device, suck a low volume it is useless. The app on the phone will show that the device is separated but there is no alert on the phone so if you don't have the app open and looking directly at it, well its of no use. The app will show a very general point on a map of the last known location. So if you lose your keys in your house, you are basically out of luck. Which brings us to the proximity location feature. It just tells you far away or close. No general direction. What does work well and is of some use is that you can press a button on the device and it will cause your phone to ring (even if in silent mode).