US Cable Headset Mono Call Center Headset HeadphoneSPA Headset for Cisco SPA303G SPA504G SPA941 SPA942 & Polycom SoundPoint 320 330 The headset complete with a 10-feet coiled cord with 2.5mm Plug. You just simply plug this modular plug into the headset port on your phone and it's ready to be used. Easy to use, simply plug the 2.5mm plug into the Cisco Spa headset port located on the right on the telephone and it's ready to be used. Loud and clear as when you are using the heandset. Compatible: Cisco SPA303G, SPA501G, SPA502G, SPA504G, SPA508G,SPA509G, SPA525G, SPA921, SPA922, SPA941, SPA942, SPA962, SPA921, SPA922, SPA941, SPA942 IP Phones Superior quality sound with the flexible adjustable noise cancellation microphone. Monaural Over-The-Head Headset Plug: 2.5mm Stereo Phone Plug for GrandStream GXP-2000 IP Phones versions 1.0 or higher