Comdio CH303A Corded Call Center Telephone Headset Headphone with Mic for Avaya 1416 2420 5410 Aastra 6757i Mitel 5330 NEC Aspire DT300 DSX Polycom and ShoreTel IP230 IP Phones SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM TODAY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW. Direct connect over the head headset headphone, No additional amplifiers or adapters required. Most easy setup headset solution, Comfortable ear and mic cushions, Super Lightweight, Super Durable Superior quality sound with the flexible adjustable noise cancellation microphone. NO Mic Mute / Volume Control built in. For Mobile Phone with 3.5mm headset jack like iPhone Samsung LG HTC Blackberry Huawei ZTE...etc, please check our items: Comdio H103-35M1 or Comdio H103-35M6