Key Finder with App - The key fob is connected to the phone via Bluetooth and the 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 searching for things. Easy to use: Simply connect the Keyfinder to your valuables and tap the app to get the alarm. Your lost Bluetooth key finder immediately beeps. If you are looking for a mobile phone, you can double-click the key finder button and the mobile app will beep to make your search easier. (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 get a bidirectional anti-loss system. When the mobile phone's Bluetooth and the mini key finder are separated, the mobile phone and the key locate the alarm. The app records the last position where the item and phone were separated, and limits the search area. (It's not a GPS) Long Battery Life and Portable - The Handy Finder uses CR2032 coin cell battery, one coin cell battery can work for more than half a year. The size of each keychain is 38 x 38 x 7mm, the weight is 24g, small and light, easy to carry. Ideal for car keys, keys, camera, tablet, toys, pet, trunk, purse, remote control, wallet, glasses, umbrella, etc. Multifunction Key Finder - The Locator of keys and objects has the function of finding objects, finding mobile phones, two-way alarm function, selfie function, recording and disconnecting function. Material: ABS Color: White + Black Quantity: 4 key finders (2 White + 2 Black) Size: 38 x 38 x 7 mm Weight: 24g APP: isearching Battery: Button cell (CR2032) Operating system: iOS and Android Quantity shipped: 4 pieces Sold by grid cool store