Intelligent two-way search:Use the mobile app to connect;Tap the phone and the device sound an alarm. Click the product button, the phone also emit a tone. Location histoy:The APP automatically record the location when the connection is disconnected easy to find lost items 85DB High Volume:The sound is up to 85db, and the work diameter can reach 10-15 meters. Easily find objects with a click:Click seach. Open the aPp and find the corresponding object finder. Click to find the object and the sound guide you to . Use range: keys, wallets, pets, bags, suitcases, etc. Colour:White Material:plastic Battery: 1-year Replaceable CR2032 Belde: 164 ft/50m Volume: Luider Ring product Measure: 42x40x10mm Package Contents: 4 * Smart 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.