Features: Parking site searching Voice recording & Self-portrait Bluetooth connection with 2 additional anti-lost devices simultaneously. Easily track lost items using your smartphone app. Helps protect children, pets, and valuables from being lost. Attach to keys, wallets, phones, watches, pets, kids, or other valuable items. Low energy consumption with a replaceable CR2032 lithium coin battery; lasts up to six months and can be replaced easily. Compact and portable design. Specifications: Material: Plastic Color: 2 x White + 2 x Black Quantity: 4 pcs Shape: Square (37 x 37 mm) Working Distance: 25 m in outdoor environment Battery: CR2032 Lithium Coin Battery 1. Find lost items – Ring your lost items via smartphone within Bluetooth range; the anti-lost device emits a loud sound until located. 2. Find your phone – Double press the button on the anti-lost device to make your phone ring. 3. Last location tracking – With the app running in the background, it records the last known location and time of your item. 4. Community Find feature – Join a global network where users help locate lost items by detecting them when in range and updating their location. Compatible Devices: Bluetooth Version: Bluetooth 4.0 Low Energy iOS 11.0 and above ( 5S and later), Android 9.0 and above Operations: 1. Power Switch: * Power On: Press and hold for approximately 3 seconds; three beeps sound ("di di di"), indicator flashes rapidly for 10 seconds. If no connection or button input occurs, the light flashes every 2 seconds for 30 seconds before turning off. * Power Off: Press and hold for about 3 seconds; one long beep ("drip") sounds and the indicator light turns off. 2. Add Device: Enable Bluetooth on your smartphone, open the app, skip the startup screen, and go directly to the "Add Device" interface. Refer to the user manual for differences between Android and iOS interfaces. Tap the "Add Device" icon as shown. Once a new device is detected, select Auto Connect. You may rename the device if desired. After connection, tap the alarm icon to trigger the anti-lost device to emit a "drip" sound. The sound continues until manually stopped by tapping the icon again. Access settings to customize ringtone, alarm distance, and other options. In system settings, view voice recordings and configure double-press functions. 3. Camera Function: Use the camera feature by pressing the button on the anti-lost device to remotely take photos. 4. Position Tracking: This function saves the last known position when the anti-lost device disconnects from the phone. The disconnection location can be viewed in the "Lost Record." For this feature, ensure GPS is enabled and the phone remains connected to the network. Package Includes: 4 x Anti-Lost Trackers (2 White + 2 Black)