Audicom Corded Call Center Headset Headphone with Mic for Avaya 1416 2420 5410 Aastra 6757i Mitel 5330 NEC Aspire DT300 DSX ShoreTel IP230 Polycom 335 and VVX310 400 Telephone IP Phones(H201STA) Superior quality sound with the flexible adjustable noise cancellation microphone. Direct connect over-the-head headset headphone, No additional amplifiers or adapters required. Most easy setup headset solution, Comfortable ear and mic cushions, Super Durable, Super Lightweight Shirt clip included. NO Mute / Volume Control built in. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, DO NOT BUY THE ITEM IF YOU HAVE NO PHONE MODELS LISTED BELOW.