Features: Parking site searching Voice recording & Self-portrait Bluetooth connection with 2 additional anti-lost devices simultaneously Track lost items using your smartphone app Helps protect kids, pets, and valuables Attach to keys, wallets, phones, watches, pets, kids, or other valuables Low energy consumption with replaceable CR2032 lithium coin battery Battery lasts up to six months; easy user replacement Mini and compact design for portability Specifications: Materials: Plastic Color: 2x White + 2x Black Quantity: 4 pcs Shape: Square (37*37 mm) Working Distance: 25 meters in outdoor environment Battery: CR2032 Lithium Coin Battery 1. Find lost items – Ring your lost items from your smartphone within Bluetooth range; the anti-lost device plays a loud sound until found 2. Find your phone – Double-press the button on the anti-lost device to make your phone ring 3. Last place seen – With the app running in the background, it records the last known location and time of your item 4. Community Find – Join a global network where users help locate lost items by updating their position when detected Compatible Devices: Bluetooth Version: Bluetooth 4.0 (Low Energy) Apple iOS 11.0 and above (iPhone 5S and later) Android 9.0 and above Operations: 1. Power On/Off - Power On: Press and hold for about 3 seconds until you hear three beeps ("di di di") and the indicator flashes quickly for 10 seconds. If no connection is made, it flashes every 2 seconds for 30 seconds then shuts down - Power Off: Long press for about 3 seconds until a long beep ("drip") sounds and the light turns off 2. Add Device - Enable Bluetooth on your smartphone - Open the app and go directly to the "Add Device" interface - Click the "Add Device" icon and wait for the device to appear - After detection, select Auto Connect - You may edit the device name as needed - After connection, tap the alarm icon to trigger the anti-lost device alarm ("drip") - The alarm continues until manually stopped by tapping the icon again - In settings, customize ringtone, alarm distance, and other options - Access system settings to view recordings and configure double-click function 3. Take Photos - Use the camera function in the app and press the anti-lost device button to take photos remotely 4. Positioning - When the anti-lost device disconnects from the phone, the app saves the disconnection location in "Lost Record" - Requires GPS enabled and active internet connection on the phone Package Includes: 4 x Anti-Lost Trackers (2 White + 2 Black) When shopping, please check product dimensions to ensure suitability. Detailed product information including features and specifications is provided in the title and description. We aim for complete customer satisfaction. If you have any questions or concerns, feel free to . We are happy to assist. Thank you for choosing our product. We hope you enjoy it.