Premium Quality Headset Headphones + Adjustable Volume + Mute Control for Cisco Ip Telephone 7931 7940 7960 7970 7962 7975 7961 7971 7960 M12 M22 and All 79xx Series Premium Quality Noise Cancelling Headset Headphone Direct Connect Over The Head Headset, No Additional Applifiers / Adapters Required Built-In volume adjustable and mute button control. Shirt clip included. Superior Quality Sound with the Flexible Adjustable Microphone Headband Style with Single Earpiece for Great Sound Quality in One Ear