Voistek A2H10D25MM Mono Call Center Telephone Headphone w/ Noise Canceling Mic Volume Mute for Linksys SPA Polycom Grandstream Zultys & Gigaset Office IP & Cordless Dect Phones w/ 2.5mm Headset Jack See Compatible Phone List in Description, DO NOT BUY IF YOU CAN NOT FIND YOUR PHONE MODEL IN LIST, Just get OUR HEADSET EXPERT HELP or ADVICE by CONTACTING US. 2.5mm headset, only compatible with phones with 2.5mm jack. For cell phone with 3.5mm jack like iPhone Samsung LG HTC...etc, pls check our items: VOISTEK K10J35 or VOISTEK H20J35. Superior call Center quality headset, excellent sound quality, lightweight, durable and comfortable for all day use Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. Flexible goose neck boom,adjustable headband,Extra comfortable leatherette ear pad, Shirt clips included, With Mute / Volume Control built in.