The BL12-A3 supports AT commands to change its configuration. To enter AT command mode:
The BL12-A3 is a compact, low-energy Bluetooth 5.0 module commonly used in embedded systems, DIY electronics, and industrial control applications. It is known for its reliable serial data transmission, low power consumption, and ease of integration with microcontrollers like Arduino, STM32, and ESP32. bl12-a3 bluetooth
I searched for a product or technical specification under the exact name "BL12-A3 Bluetooth", but it does not appear to be a standard or widely recognized model from major Bluetooth chipmakers (like CSR, Qualcomm, Realtek, or Broadcom) or common commercial electronics brands. The BL12-A3 supports AT commands to change its configuration
It is likely one of the following: