Features: Anti-Theft Key Finder: Smart Key-Tracker is a great little tool to remind you when you want to forget your belongings. Pair it with the apps and keep it running on the back end, once it's disconnected, the phone and key locator will rings to alert you, perfect for traveling and avoiding loss. Portable and Convenient: The smart key finder has a small design and is easy to carry. You can put it in your wallet as a wallet picker, or together with your phone as a phone picker or other item picker, bringing you convenience anytime, anywhere. Find Your Items: Key Locator is a great little tool to help you search and find the items you always misplaced. Just hangs it on your luggage, wallet, keychain or pet. If you can't find an item, double-tap the button on the apps and it will beep to help you finds it quickly and easily. Easy to Use: Use cellphone's Bluetooth-function to search and connect to the device, small and portable design: the key finder is easy to connect, very stable and can keep connection well. Good Choice of Present: These tracking devices can be applied by yourself, or given to your friend with poor memory, or junior. For them, these smartphone keychain alarms are considerate present to receive Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Working voltage: DC3.0V Wireless distance: 40m