The Wireless Bluetooth Module is a compact Bluetooth module which is easy to control and configure. Wireless Bluetooth Module: with this HC 05 Bluetooth module,You can quickly add the Bluetooth feature to your project, and then you can use your android phone to control some gadgets, such as: switch, LED. Master and Slave 2-IN-1 HC 05 Module: Working Voltage 3.6V to 6V , Default baud rate: 9600, Default pin:1234 Button: Press the button, the module enter the AT mode. AT commands are executed only in AT mode. 6 PIN Dopunt Cable: with this Cable, you can easily connect this Bluetooth module to your Board Specification: Supply voltage: 3.6 to 6V, prohibit exceeding 7V Number of pins: 6 PCB Size: 43 x 15 x 6mm / 1.69 x 0.59 x 0.24inch Length of Dopunt Cable: 20cm / 7.87inch Default bauld rate: 9600 Default pairing password: 1234 Operating modes: Master / Slave Material: Plastic & Metal Wiring method: VCC: Connect the power supply positive GND: Connecting the cathode RXD: The receiver, the Bluetooth module receives data from other devices, and the sending end TXD of the other devices normally TXD: Send end, BT module sends data to other equipment; the receiving end RXD of the other equipments normally En: To enable the end, need to enter the at mode when 3.3V Package Includes: 1 x 6 Pin Wireless Bluetooth RF Transceiver Module 1 x 6p Cable Note: This item doesn't works with iOS.