Smart and Size Finder: suitable for key, wallet, bag and umbrella; It will alert you when you go away from the target out of the range, so you don't have to worry about losing something..: press the button for a few seconds, it will turn on after you hear 2 beeps; Then use cellphone's Bluetooth to search and connect to the device, if you lost your cellphone, double press the tracker button, your phone will alarm. You can download the App "iSearching" from the App store, or scan the QR code that comes with the manual to download the software..Distance and Disconnecting: about 15 meters working distance for updating, once your items go out of range and get lost, the APP will automatically record the last place where this item locator is disconnected from your phone,so you can speculate approximate location based on the last recorded spot shown in the APP map to find your missing items, both cellphone and item finders would ring together and last about 10 seconds when disconnecting, this function could be shut down in setting.. to Taking Photo: use the camera function and press the anti loss device to take pictures when you need selfie..Long Battery Life : battery is included. The Bluetooth key tracking device is powered by CR2032 battery with super long standby time over 10 months and can be replaced easily for long-term use. Delicate and elegant appearance makes it look like an art of pieces.