2PCS Wireless Bluetooth Master-Slave 2 in1 Module RS232 / TTL This Bluetooth with Blue2.0, Modify master & slave mode at any time master and slave mode is the same as the hardware to support the AT command set to support the baud rate 2400 to 1382400 The current firmware has been modified for the new version: The default setting for serial port 9600, N, 8,1 Support the AT command to modify the baud rate, device name, passkey, master or slave mode (master and slave mode can be modified by AT commands) connection with the non-connection state signal output, easy to track the status of module MCU Used for embedded wireless serial transmission alternatives