Intelligent two-way search: Use the mobile app to connect; tap the phone and the device sounds an alarm. Press the product button, and the phone emits a tone. Location history: The app automatically records the location when the connection is disconnected, making it easy to find lost items. 85dB high volume: The sound reaches up to 85dB, with an effective range of 10-15 meters. Easily find objects with a click: Open the app and select the corresponding object finder. Click to locate the item, and follow the sound guidance. Use range: Keys, wallets, pets, bags, suitcases, etc. Color: White Material: Plastic Battery: 1-year replaceable CR2032 Range: 50 meters Volume: Loud ring Dimensions: 42 x 40 x 10 mm Package Contents: 4 x Smart trackers 1 x English manual Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause slight color variations between the item in the picture and the actual product. Measurement error allowance is +/- 1-3 cm.