1. "Find My" location: Work with Find My APP,when the smart icard out of bluetooth range with your ,you will get notifacation on ,what's more, it can be tracked without distance limit to anti lose,as long as there is other ios devices near by 2.Lost Mode - Enabled: Enter your contact phone number, etc. If the device has been disconnected from your phone for more than a while, and there is another Aple device near the device,you will receive notifications and the latest location of the smart card 3.Play the sound: Mobile phone and device in the BLE model domestic(generally about 20 meters),in the "Find My" App, click, play the sound,the device will issue a prompt sound, help you quickly find the near by smart card. 4. Rechargeable battery: Wireless Charging,it will more convenient for power supply (charging stand is not included) Colour:Black Material:ABS Package Contents: 1x Smart Card Tracker(Rechargeable) 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.