For OnePlus 7T Pro Rivet Buckle 9 Cards Three Fold Leather Phone Case(Black) Tag-Earpiece Speaker Peer-to-peer accessibility maximum transmission distance:

Peer-to-peer accessibility maximum transmission distance: 500 meters

Support multiple systems: Win XP /Win7/Win8/Win10/ Vista /Mac OS9/10 and Linux operating system

Indoor ceiling receiver: Install it in a place where there is no signal indoors

7) Wide Dynamic

For OnePlus 7T Pro Rivet Buckle 9 Cards Three Fold Leather Phone Case(Black) Tag-Earpiece Speaker Peer-to-peer accessibility maximum transmission distance:1. The design is reasonable, and precisely fits for your phone. 2. Simple, comfortable, easy to carry. 3. It adequately protects devices from the normal scratches, dirt, tear and wear. 4. All buttons and ports are easy to access. 5. With good performance, it may work for a long time.