Comdio CH501VA1 Corded Call Center Telephone Headset Headphone with Mic + Volume Mute Contol for Aastra 6757i Mitel 5330 NEC Aspire DT300 DSX Polycom VVX Avaya 1416 2420 5410 and ShoreTel IP Phones 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 Lightweight, Super Durable Shirt clip included, Mic Mute / Volume Control built in. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM TODAY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW.