Pin connection and description: Connector pin assignments before you must find, especially GND must not be connected to the voltage pin, and RX and TX side do not connected to the VCC pin, the (actual measurement had some VCC pin voltage up to 14V.) Wrong shall be burnt chip adapter cable, be sure to note, do not take their own small board to do the experiment, otherwise we are not responsible for any burn. We must find a good pin definitions in the access. Connection : Again Brush only need three lines, generally used only RX TX GND three signal lines, VCC no connection. The above is 4,5 needles friends, not to VCC and BT needle. Please use the RXD and target board TX phase, TXD and target board RX phase, GND connection GND, if not, were reversed RX and TX. size:about 1 meter in length Material:PVC+plastic colour:Black Package Contents: 5 x PL2303HX cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.