CALLANY Call Center Telephone with Noise Cancellation Headset (HT500) 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. CALLANY Call Center phone widely used in home office, business corporation, telephone counseling services, insurance, banks, hospitals and so on. It is conveniently set-up with the headset out of the way when not in use, and that is strong compatibility. Completely satisfies telephone counseling services, phone sales, telecom operators etc. You must have it! Clear and distinguishable for speech sound. Operate easily, communicate conveniently. High quality noise cancellation headset. Headset speaker volume control by knob. Flash and Mute function. Redial feature lets you quickly call the last outgoing number. Three Ringer Volume Settings (off, low, and high). Flash Time 100/600 ms selectable FSK/DTMF caller id display &amp; automatic checking. Don&#039;t need additional power. Comfortable monaural design and more efficiency Delivers outstanding sound on both ends of the call. Adjustable headband and microphone boom arm let you find the perfect fit. NOTE: It is only a 4-Pin RJ9 Crystal Headset, not USB headset &amp; not 2.5mm headset &amp; not 3.5mm. Noise cancellation Durable &amp; Comfortable Super-soft leatherette headband and ear cushions. Telephone Host, Noise Canceling Headset, Headset Holder, Telephone Line Cord, User&#039;s Manual CALLANY products have been well tested before delivery. If you have any questions, our friendly support team will be more than happy to help out.