Hands-Free Call Center Headset Headphone with Flexible Lightweight Metal Headband, Foldable Noise Cancelling Microphone Optimum Voice Mic, RJ9 Plug for Telephone Counseling Home Office - JVR OI08 Direct connect over the headset headset headphone. No additional amplifiers or adapters required. Superior quality sound with the flexible adjustable noise cancellation microphone. Most easy setup headset solution, Extra ear and mic cushions. Shirt clips included. NO Mute / Volume Control built in.