This programming cable is designed for quick and easy programming of Motorola MTX820S handheld transceiver. The internal converter circuit board mounted in the DB9 plug. It requires an external 9VDC battery (not supplied), which should be connected to the DC lead fitted to the DB9 plug. This single programming interface cable completely replaces Motorola RLN4008 Radio Interface Box (RIB) with RTK4205 cable. 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.