The CUIPC1 UI to PC Cable from Sennheiser is designed for use with your BW900 Wireless Office Headset. The CUIPC1 connects the UI box to your PC's standard sound card for utilizing the BW 900's voice recognition feature. The cable features a modular plug and two 3.5mm jack plugs.
For the BW 900's voice recognition feature
UPC: 615104053731