The Radius U10P-S Reverse Wired Connection Lead is a lead / cable that will connect your Radius Headset to your telephone. It is commonly known as a bottom cable or a connection cable and is compatible with all four of the headsets in the Radius range (Headset ASINs are: B004O6LEGU, B004O6LEH4, B004O6LEHE and B004O6LEHO)
At one end of this lead is the Quick Disconnect plug (QD) which connects to the QD socket at the end of the Radius headset, it is called quick disconnect as you can quickly disconnect it from the headset if you need to move away from your desk phone during a call and reconnect it when you return to your desk phone to continue the call. The other end of the cable connects to the phone, this particular type of connection lead is commonly used for connecting your Radius headset to Panasonic KXT corded telephones.