Noise Cancellation Microphone: The call center phone equipped with noise canceling microphone, it can increase the voice clarity for superior high quality sound. Flexible Rotation Arm: Microphone arm of the headset telephone can rotate by 330 degrees freely to fits you, extremely soft ear cushion, suit for 7x24 hours high-frequency using. Easy to Setup: Connects to existing standard telephone jack, don\'t need any batteries. Durable construction and rigid design for greater longevity. Enables Hands-free Conversations: The call center headset allows you to speak and listen without holding the handset, thus increasing work efficiency. FSK/DTMF dual system auto switch. 12 Months Refund: Our customer services team will be happy to service for you all the day. If you have any problems or not feel satisfied with the telephone headset, please don\'t hesitate to contact us, we will give you a positive feedback.