Module HC-05 master and slave two in a module, computer and adapter, PDA, seamless connection, used for GPS navigation system, water and electricity gas meter reading system. Features - PCB Dimensions: 37.3mm (length) * 15.5mm (W). - Input voltage: 3.6V - 6V, 7V prohibit over. - Power anti-reverse, reverse module does not work. leads to 6 pin: EN / VCC / GND / RXD / TXD / STATE ( status leads to the foot, is not connected to the output low, output high after the connection). - Status indicator, LED flash means no connection; LED slow flash indicates into the AT command mode. - On-board 3.3V regulator chip, the input voltage DC 3.6V-6V; when unpaired, current is about 30mA (because LED lights flashing, the current state of change); After the pairing is successful, the current is about 10mA. - Level interface 3.3V, you can directly connect a variety of microcontroller (Arduino / 51 / AVR / PIC / ARM / MSP430, etc.), 5V microcontroller can also be directly connected. Directly connected to the microcontroller serial port, you can not go through MAX232 chip! - The open area effective transmission distance of 10 meters, over 10 meters are possible, but do not guarantee the quality of the connection. - After the pairing is successful, can be used as a full-duplex serial interfaces. Do not need to know any of the protocol, but only supports 8 data bits, 1 stop bit, no parity communication format. This is the most common communication format, not support other format! - Press the button to give the module is powered up can enter AT mode, set parameters and query information. - You can switch between master and slave mode via AT commands. - The module default baud rate is 9600, the default passkey is 1234, the default name for the HC-05. - Protection with transparent heat shrinkable tube.Packing list: 1 * module,_x000D_ 6 * set cable