If you hand BLE device but forget where the iPhone is or hand iPhone but can't find your BLE device, don't worry, they can find each other. Push the button on BLE device to make the iPhone ring. Or use this App to make the BLE device buzz and blink.
And, with 'Report lost' function on this App, anyone who have PQTag app installed can help you to find your stuff attached with BLE device . You will receive a notification contains the location info where your stuff is, whenever your stuff attached with BLE device was scanned by other iPhones which have this App installed.
Note: Continued use of GPS running in the background can dramatically decrease battery life.
1.iPhone 4S, new iPad or later Apple devices
2.At least one BLE device Link Lost Service supported