OVHS084-CUF, OvisLink dual ear corded call center headset compatible with Cisco Unified IP phone models. It gives user superior voice quality and all-days comfort. It is an Over-the-Head style headset with two speakers over user's both ear to help user focus on phone conversation. This headset comes with a quick disconnect cord connects the headset with Cisco phone's headset jack. No need additional adapter nor amplifier. No need installation. Just connect the headset to the phone, use keys on the phone keypad to activate the headset, change headset volume, mute...
Headset features
Noise-Canceling microphone
Built-in Acoustic Shock Protection, to prevent electric overload
Soft, leatherette ear cushion
Rotatable and flexible microphone boom
Two earpieces on both ears
Click-Stop adjustable headband
RF-Shield, Tangle-less cord
Durability
Comes with a RJ9 Quick Disconnect cord
* Acoustic Shock Protection - when the electric overcharge signal of 6v or above comes to the receiver, it will be cut off automatically.
* * Comes with 2 Years Warranty. User guide is printed at the bottom of the headset box.
This OvisLink call center headset is compatible with Cisco Unified Series IP phone 6900 series: 6921, 6941, 6945, 6961, 7800 Series: 7821, 7841, 7861, 7931G, 7942G, 7945G, 7962G, 7965G, 7975G, 8800 Series: 8811, 8841, 8851, 8861, 8941, 8900 Series: 8945, 8961, 9900 Series: 9951, 9971.

For Cisco Small Business IP phone SPA300 Series SPA303,SPA500 Series SPA501G, SPA502G, SPA504G, SPA508G, SPA509G, SPA512G, SPA514G, SPA525G, SPA525G2, purchase Headset model OVHS084-SPA ASIN # B00K2A04T0.
Scroll down to download User manual under Product Information section.