Bluetooth 4.1 module with headphone output HW-770

Embedded Bluetooth module for receiving audio signal, supporting Bluetooth 4.1 standard.
For the module to work, it is enough to supply power to the board, connect headphones or an amplifier to the output and connect to it from a PC, smartphone or other device.
After turning on the device, the blue LED will light up. Find "XY_BT" in the list of bluetooth devices, and connect to it.

Specifications:
Power: 3.7-5V
Audio output: AUX 3.5mm stereo
SNR: 90dB
THD+N: -70dB
Crosstalk: -86dB
DNR: 91dB
Supported Profiles: A2DP/AVCTP/AVDTP/AVRCP/HFP
Reception range: up to 15 meters
Size: 30*30 mm.