Headset Headphones With Volume + Mute Control for Cisco SPA Series Spa303 Spa504g and Other, Polycom Soundpoint Ip 320 330, Grandstream, Cortelco
Noise Cancellation Microphone improve sound quality in noisy environment, this direct connect headset is the most cost-effective headset solution designed to increase your productivity. This headset will not require any additional adaptor nor amplifier. They plug directly into the headset port at the right of your telephone. Built-in remote adjustable volume and mute button control. The headset complete with a 10-feet cord with a 2.5mm port via a quick disconnect cable solution. Simply plug the headset 2.5mm plug into the telphone headst port and it is ready to be used. Also included FREE EXTRA leathered ear cushion cover + microphone cushion cover.  Compatible : all Cisco SPA series like SPA phone SPA303, SPA501G, SPA502G, SPA504G, SPA508G, SPA509G, SPA512G, SPA514G, SPA525G, SPA525G2. SPA921, SPA922, SPA941, SPA942, SPA962 IP, and other brand with a 2.5mm headset port like Polycom, Linksys, Grandstream, Cortelco