Are you looking for a professional, yet anti-lost tracking device? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? , ! Our anti-lost tracking device must meet your needs. It is one of the for you. Features -Material: ABS -Size: 4.00X4.00X1.00cm/1.57X1.57X0.39in -Battery capacity: 210mAh -Battery: Button Battery(Not included) -Its effective tracking range can be used up to 25 meters in an open area. You can even use it on your baby or pet. -Bind the anti-loss device to valuables. When the device is connected to the mobile APP, use the search function of the APP to make the anti-loss device sound, so as to find the items. -When the item is disconnected from the mobile APP, the APP will record position of the item after being disconnected, and position will be displayed in the map of the APP. -Small and compact size, light in weight, you can carry and use it wherever you go. - workmanship, reasonable structure, professional and practical, can bring you convenience. Package list: 1 × Tracking Device 1 ×Metal Ring