4Call K502KMD Binaural Call Center Telephone Headset headphone with Mic for Grandstream IP Phones GXP1400 GXP1405 GXP1450 GXP2124 GXP2120 GXP2140 GXP2140 GXP2160 GXP2110 GXP2100 GXP2020 GXP2010 GXP1200 GXP280 GXP285 GXV3005 GXV3006 GXV3240 GXV3275 WORKS ONLY FOR SOME SPECIFIC PHONES, BUY ONLY WHEN YOU HAVE ONE OF THE PHONES LISTED BELOW IN DESCRIPTION Direct connect headset, no additional amplifier or adapter required. Adjustable fit headband and comfortable ear cushions enhance for wearing comfort, even for long periods. With two earpieces and a noise canceling microphone, this headset is ideal for noisy offices. It delivers high quality sound to both ears, enabling you to concentrate fully on the caller with minimal distraction & superior sound pick up. Flexible microphone boom, 270 degree rotatable, which adjusts to suit your preference, you can also choose to wear the microphone on either your right or left side. Long coiled cord stays out of your way by stretching for long reach, and coiling up for regular use. Shirt clip keeps the weight of the cord off your head while you talk, and lets the headset hang freely when you take it off.