Callez Corded Office Telephone RJ Headset with Flexible Noise Canceling Mic and Quick Disconnect for Toshiba Aastra Nortel NEC Mitel ShoreTel InterTel Talkswitch Iwatsu Packet8 IP Phones (300QDRJ1AA) Direct connect over-the-head headset, No additional amplifiers or adapters required, Most easy setup headset solution. ONLY PURCHASE IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW, CHECK OUR STORE FOR HEADSETS FOR OTHER PHONE MODELS OR CONTACT US FOR COMPATIBILITY GUIDE! Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions. NO Mic Mute / Volume Control built in.