Seneo Hands-free Call Center Headset Telephone Comfortable to Wear: Compact appearance and human engineering design for comfortable wearing experience. FSK/DTMF: The dialer can ring or silent when receive incoming calls as well the phone number will be displayed. Flexible Rotation Arm: 330free rotation, reversible for use with either ear. Noise Cancellation: Noise cancellation microphone increases the voice clarity and allows superior high quality sound. No additional power source or adapters required, most easy setup headset solution.