Sennheiser d 10 phone is a streamlined single sided wireless dect headset connecting directly to the desk phone to provide uncompromising sound for office professionals sennheiser voice clarity and noise canceling microphone optimize speech intelligibility designed for all day use d 10 phone is a lightweight headset with 2 in 1 wearing style ear hook and headband features include phone conferencing hot desking and sennheiser activegard hearing protection against acoustic shock