There are plenty of decent smartphone power banks available on the market. Not all of them come with a Bluetooth tracker though. The CoalBit is different. It is a compact power bank that you can carry with your keys to charge your phone and locate your misplaced items. The device can alert you when you have forgotten important items.
CoalBit comes with a mini flashlight as well. You can use it to find your phone, send a SOS signal to your friends, and get unstuck. The device is expected to be available for iOS or Android devices.[where to get it]