MICROPHONE MUTE & VOLUME CONTROLLER Beebang phone headsets with noise cancelling microphone are built with in-line control of mic mute and volume adjustment. So you can easily mute and un-mute your voice during calls. The landline deskphone headset is compatible with Polycom, Avaya, Nortel, Grandstream, Yealink and more. | HD AUDIO SOUND: Office headset with wideband speaker delivers crystal clear sound for easy communication. With unidirectional noise canceling microphone, the telephone headset can block out unwanted background noises for the other end callers to hear clearly, perfect for use in noisy environment. | SUPER COMFORTABLE: Light weight design call center headset with adjustable headband fits for different head sizes. Soft protein leatherette ear cushion, skin-friendly, durable and very easy to clean, with 180°rotatable earpieces ensures the customer service headset to bring all-day long comfort wearing. | GREAT DURABLE: The Hands-free wired RJ9 headset with tough design, strong headband, quality plastics, superior microphone and speaker allows for 24/7 heavy use in offices, call centers and homes. Reinforced cord of the communication headset is built with Kevlar to withstand office chair wheels, sharp objects, can rival with Jabra headset for heavy use. | WARRANTY: WE OFFER 30DAYS MONEY BACK GUARANTEE AND TWO YEARS WARRANTY for the corded telephone headset with mic, professionally designed for Call Center, Telemarketing, Office, Business, Phone sales, IT Department, Customer Services, Consulting and more.