Bluetooth luminous marked cards CVK 911 spy earpiece
CVK 911 one to one spy earpiece is a new arrival called cards earpiece. A set of CVK 911 contains a signal receiver and a spy playing cards earpiece.
Compare with other invisible marked cards earpiece, this CVK 911 has 5 advantages.
1. Its frequency is connected with signal receiver.
2. Multi-frequency design.
3. The transmission distance is enhanced to 10 meters.
4. Bluetooth is another connects way.
5. No need to buy a set of it if you lost one of them.