OVHS072-STL OvisLink Single Ear Call Center Headset compatible with ShoreTel IP phones. It comes with a RJ9 Quick Disconnect cord directly connect the headset to ShoreTel IP phone's headset jack. No amplifier is needed. Headset volume, mute function can be controlled by pressing the buttons on the phone's keypad. To activate or deactivate the headset connected with the phone, simply press the headset button on the telephone keypad. This OvisLink Call Center headset services user with solid, crystal clear voice quality. The OVHS072-STL is a corded call center headset with Over-the-Head design. With its flexible and Rotatable microphone boom, user may place the headset speaker on the left or right ear anytime. The headset features with Acoustic Shock Protection (when the electric overcharge signal of 6v or above comes to the receiver, it will be cut off automatically), Noise Cancellation, lightweight, leatherette ear cushion, flexible microphone boom, adjustable headband and Tangle-Free coiled Quick Disconnect cord. This OvisLink Call Center Headsets are designed for users who work in call centers, service centers or sales departments and talk long hours on the phone and feel comfort. This headset is Compatible with ShoreTel IP phone models: 665, 485G, 480G, 480, 420, 265, 230G, 230, 212k