Features: Parking site searching Voice recording & self-portrait Bluetooth connection with up to two anti-lost devices simultaneously Track lost items using your smartphone app Helps protect kids, pets, and valuables Attach to keys, wallets, phones, watches, pets, or other belongings Low energy consumption with replaceable CR2032 lithium coin battery Battery lasts approximately six months; easy user replacement Compact and portable design Specifications: Materials: Plastic Color: 2 white + 2 black Quantity: 4 pcs Shape: Square (37 x 37 mm) Working distance: 25 meters in outdoor environment Battery: CR2032 lithium coin battery 1. Find lost items – Ring your lost item from your smartphone within Bluetooth range; the anti-lost device will emit 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 place seen – With the app running in the background, it records the last known location and time of your item 4. Community finding feature – Join a global network where users help detect and update the location of lost items when nearby Compatible Devices: Bluetooth version: 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 about 3 seconds; three beeps ("di di di") indicate startup, indicator flashes rapidly for 10 seconds. If no connection or button input, it flashes every 2 seconds for 30 seconds then powers off - Power off: Long press for about 3 seconds; one long beep ("drip") and the indicator light turns off 2. Add device Enable Bluetooth on your smartphone and open the app. Skip the welcome screen and go directly to the "Add Device" interface. Refer to the instruction manual for differences between Android and iOS interfaces. Tap the "Add Device" icon. After detecting a new device, select Auto Connect. Once connected, tap the alarm icon to trigger the anti-lost device to emit a "drip" sound, helping you locate it. The sound can be triggered repeatedly; tapping again stops the sound. In the settings menu, customize alert ringtones, set alarm distance, etc. Access system settings to view voice recordings and configure double-press functions 3. Take photos Use the camera function by pressing the button on the anti-lost device to remotely capture photos 4. Position tracking This function records the location when the anti-lost device disconnects from the phone. The disconnection location is saved in the "Lost Record." Requires GPS enabled and active network connection on the phone Package includes: 4 x Anti-lost Trackers (2 white + 2 black) Please check product dimensions before purchase to ensure suitability. Detailed product information including features and specifications is provided in the title and description. For any questions, feel free to reach out. We aim for complete customer satisfaction and are committed to providing support. Thank you for choosing our product. We hope you enjoy using it.