Comdio CH201VA11 Corded Call Center Hands-Free Phone Headset + Volume Mute Control with Comfort Fit Headband for NEC Aspire Nortel M2616 M3904 Plantronics A100 T10 T20 Aastra Telecom Shoretel Avaya Direct connect over the head headset headphone, No additional amplifiers or adapters required. Superior quality sound with the flexible adjustable noise cancellation microphone. 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.