Wallet TrackR - Bluetooth 4.0 Device - Retail Packaging - Black Easily find items using the app distance indicator Ring the Wallet TrackR device to quickly find lost items Stay organized with a map of where your items are located Ring a misplaced smartphone with the TrackR device button, even when the phone is on silent! No need to recharge! Wallet TrackR runs on replaceable batteries that can last for up to 2 years Works with your iPhone and Android 4.4