With USB serial port and Master bluetooth module HC06， can receive and transmit data from master Bluetooth module by operating USB serial port; Only matches with HC06 slave modules， can't do with computer or cell phone; With indicator lights: RX，TX， BT( the bluetooth status indicator)， D3 (the USB serial port ready indicator); The bluetooth status indicator light (BT): slow flash: already matched but temporarily not connected with any slave module， Steady on: already connected with the slave module， quick flash: searches link to the slave module; Set button to refine your search; Directly via USB serial port to transmit AT command of setting parameters. A product for Arduino that works with official Arduino boards.<br /><br />Packing List<br />1 x Wireless Bluetooth module<br /><img src="http://img6.eachbuyer.com/x9/p100/eb03174_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb03174_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb03174_3.jpg" />