Sennheiser Universal Interface Box to PC cable CUIPC-1 For the BW 900's voice recognition feature For Dragon NaturallySpeaking Modular plug to two x 3.5mm jack plugs Use cable CUIPC1 to connect the BW 900 base station to your PC soundcard. Compatible with all voice-enabled Bluetooth chipsets and dongles (dongle/chip must carry HSP or HFP)