NBL1018-dat

https://www.electrodragon.com/product/30ft-3-3vdc-wireless-bluetooth-rf-transceiver-module-rs232-ttl/

Note

• BC04 is better than HC05, HC06.
• Enter into serial UART mode (AT commands)  BEFORE paired.
• Before bluetooth connection established, it's supported by AT commands to set the baud rate, name, pairing password, parameters setting will save after power-down.  
• Automatically switches to transparent mode after the Bluetooth connection set.

ref

• BC04-B-dat

• NBL1018