Durable, 5ft cord. 2-Year Manufacture Warranty Included! (See OvisLink 2-Year Warranty policy on ). Over-the-Head style. Click stop adjustable headband. Leatherette Ear cushions. Flexible and Rotable Microphone boom. Comes with RJ9 and 2.5mm Quick Disconnect Cord Directly plug into telephone headset jack, no need amplifer. Compatible with Polycom SoundPoint IP 335, 450, 550, 650, 670; Compatible with Microsoft Lync CX200, CX600 and Media Business Phone VVX101, VVX201, VVX300/310, VVX400/410, VVX500, VVX 600, SoundPoint IP 321, 331, 331c, SoundPoint Pro SE-220, SE-225. Premium voice quality Corded Dual Ear Call Center Headset with Noise cancelation, Acoustic Shock Protection and RF-Shield.