Proposed design is using a small chip size with competitive price.

Both sides use monitor connection system, great anti-interference function 

provides a more stable signal.

Support seamless connection, master-slave auto role switching, master-slave power 

automatic balance switching.

Support single earphones use for phone call, supports dual microphone call noise cancellation.

Apply intelligent charging case, simple use, paring is done within charging case.

BT5.1 version dual-mode, super low power consumption and longer standby time.