Why MAIRDI USB headset? Ergonomic designed, light weight and super comfortableBuilt-in noise-reduction sound card to suppress unwanted noises and echo from devices.DSP technology provides outstanding audio on both microphone transmit and speaker receivePlug and Play USB headset, no drivers needed, directly connect the headset to PC and ready for useProfessional PC telephone headset, ideal for office business conference calls, webinar presentations, call center soft phone calls, speech dictation, online courses and Skype chat... Call Reminding Controller box built with outer ringer for calls reminding. You can know call on PC is coming when you don't wear headset or when you are away from desk. Slide off the switch on the back if you want to turn off the outer ringer. Busy Light Indicator The ring light will be green when in idle state. When call is coming, the ring light will flash in red. It becomes solid red during a call. Manually switch the ring light into red by pressing the call button if you don't want to disturb by colleague. Call Button The call button allows you to answer and end calls from softphones of Microsoft Teams, Skype for Business and Cisco Jabber. The noise-canceling microphone effectively reduces unwanted background noise, enabling clear calls even in noisy environments.Hearing protection technology removes sudden loud or high-pitched noises before they reach your ears.The reinforced cable built with kevlar withstands daily use and is protected from office chair rolls, sharp objects and the like. Wideband Audio Sound Noise Canceling Microphone Durable Construction Light Weight and Comfortable In-line Volume Adjust and Microphone Mute Wide Compatibility and Simply Plug and Play USB Connectivity With PCB circuit built in to block out sudden loud sound for hearing health protection. Ear cup 180° adjustable for proper positioning on ears. Metalic sleeky design with great durability. Unidirectional microphone with good noise canceling effect to cancel background noises for clear microphone voice. Microphone arm 330° rotatable enables headset microphone to be adjusted on either side. High-grade super soft leather ear cushion, user-friendly hygiene and reliable to withstand worn, very easy to clean.