***** **********Best Quality Guranteed. *****3 Year warranty. flexible microphone boom arm with 270 degree rotation of selective wearing for left or right ear. Ergonomic curved headbands for comfort wearing with smooth click stop for adjustment and strong connection between headband and speaker body. 2.5 mm jack curly clable with Plantronics style QD "*****Ciso SPA Series, Polycom IP 320, 321, 330 and Other Cordless phones with 2, 5mm Standard Headset Port. (3 poles with 2 black bands), No Smart phone use. *****Grandstream GXP-2010, GXP-2020, GXP-2100, GXP-2110, GXP-2120, GXP-280, GXP-285, BT200, BT201, Zultys ZIP 4x4, ZIP 4x5, Pansasonic, AT&T Cordless phones with 2.5 mm jack.
*****IF YOUR PHONE IS NOT ON THE LIST, PLEASE ASK US FOR CHECK THE COMPATIBILITY WITH YOUR PHONE.