Key Finder with App - The keychain is connected to the phone via Bluetooth and isearching App. You can scan the QR code in the manual or download the isearching App from Google Play or App Store. It supports iOS and Android phones. The key finder helps you not waste time looking for things. Easy to Use - Just connect the Keyfinder to your valuables and tap the App to get the alarm. Your lost Bluetooth key finder will beep immediately. If you are looking for a mobile phone, you can double-click the button of the key finder, and the mobile app will beep to facilitate your search. (Note: The effective distance between the phone and the Bluetooth key finder is about 15-25 meters) Two-way alarm function - Turn on the Bluetooth Disconnect Alarm switch in the software to achieve two-way anti-lost. When the Bluetooth of the mobile phone and the mini key finder are separated, the mobile phone and the key will locate the alarm. The app will record the last position where the item and the phone were separated, and limit the search area. (This is not a GPS) Long battery life and portable - The Handy Finder uses a CR2032 button battery, one button battery can work for more than half a year. The size of each key ring is 38 x 38 x 7 mm, small and light, easy to carry. Ideal for car keys, keys, camera, tablet, toys, pet, trunk, handbag, remote control, wallet, glasses, umbrella, etc. Material: ABS The key finder is connected to the phone via Bluetooth and a search application. It supports iOS and Android phones. Easy to use. The effective distance between the phone and the Bluetooth object locator is about 15-25 meters. Long battery life and portable. The key finder has the functions of searching for objects, searching for mobile phones, two-way alarm function, selfie function, recording function and disconnection positioning function. Ideal for car keys, keys, camera, pet, trunk, handbag, remote control, etc. Material: ABS Color: White + Black Quantity: 4 key finders (2 White + 2 Black) Size: 38 x 38 x 7 mm APP: isearching Battery: Button Battery (CR2032) Operating System: IOS7.0 or above, Android 8.0 or above