Usage Bluetooth protocal : Bluetooth Specification v2.0+EDR Frequency : 2.4GHz ISM band Modulation : GFSK(Gaussian Frequency Shift Keying) Emission power : response to AT command; LOW or floating -> regular work status. * With build-in reset circuit, reset is completed automatically after powered on. * Steps to set to MASTER: * Set PIO11 HIGH with a 10K resistor in between. * Power on, module comes into AT Command Response Status * Open HyperTerminal or other serial tool, set the baud rate 38400, 8 data bits, 1 stop bit, no parity bit, no Flow Control * Via serial port, send characters "AT + ROLE = 1 r n",if successful, return "OK r n", where r n is carriage return. * Set PIO11 LOW, re-power, then in Master state, automatically search for slave module and connect. Package List: 1 * Arduino Serial Port Bluetooth Module (Slave)with 4P DuPont Cable