Dual Ear 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 Dual Ear Sides 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. SEE COMPATIBLE MODELS BELOW Headband Style with Dual Earpieces for Great Sound Quality in Both Ears