Description: Product size: 3.65*3.25*0.72cm Product packaging: OPP Packing size: 4*4*1cm Working distance: ≤25m (outdoor environment) Battery: CR2032 lithium coin battery can last about half a year. (Only Bluetooth Tracker- not battery.) Please download the application before use. The application itracing is available on the App Store and Google Play. Size: 36.5mm * 32.5mm * 7.2mm How to use: please see the manual Product material: ABS + electronic components Package list: 1x Bluetooth tracker- 1*English manual Notes: 1. 1 inch = 2.54 cm 2. Please measure it yourself to choose the right size. 3. Due to the difference between the different displays the picture may not reflect the actual color of the item. Thank you!