Standard microphone sensitivity Features Easy Disconnect For use with all switches & amplifiers Direct connection to most of the phones Sennheiser CSTD 01 Cable Providing quick & hassle-free connectivity to most telephone systems for Sennheiser headsets, this cable features a durable design & a coiled cord to prevent it from getting tangled up. It is a standard bottom cable with an easy-disconnect plug on one end & a modular plug on the other for quick installation & ease of use.