This programming cable is designed for quick and easy programming of Entel HT903 handheld transceiver. The internal converter circuit board (interface) mounted inside the DB9 shell. The FTDI USB to RS232 DB9 serial port adapter is supplied with this cable. The power supply is done over the USB interface. This cable does not include any manuals or instructions for use. Therefore, it will be assumed that the purchaser is knowledgeable in using the cable for the applications it is designed for. Please note that we supply the hardware only, we don’t supply the programming software.