Polycom SoundPoint and Allworx IP Phones Compatible Call Center Headset Noise cancelation, Acoustic Shock Protection and RF-Shield Lightweight, Over-the-Head style, Soft Leatherette Ear Cushion Rotatable, Flexible Long-lasting metal microphone boom, Adjustable head-band RJ9 and 2.5mm Quick Disconnect Cord Directly plug into telephone headset jack, no need amplifer Clear sound, durable, 5ft cord