1. Using professional 40mm driver, the built-in chip continuously optimizes the call experience through noise reduction and vocal correction. Wideband audio gives you clearer conversations, and acoustic shock protection circuitry protects your hearing. 2. Built-in noise-cancelling card and earmuff design, let you get an excellent quiet environment. Equipped with a wired controller, you can adjust the volume, microphone and speaker on/off buttons, helping you to use it easily in various occasions. 3. Easy to use, plug and play. 4. The earmuffs are filled with imported slow-rebound pads, which are soft and comfortable, and the ears will not hurt when worn for a long time. 180-degree rotatable boom microphone ensures precise positioning and optimal noise reduction, giving you crystal clear sound in high definition for effective calls 5. The length of the headphone cable is long enough to move freely within a certain range to meet your various needs Perfect for call center, business, Skype chat, games, teaching, online courses, etc. Enjoy the convenience of our USB headsets for common chat and system applications. Widely compatible with Windows 2000/7/8/10/XP/Vista, Mac OS X, iOS, Android, Tablet. Interface type: USB2.0 Speaker Impedance: 32 ohm Speaker frequency response: 20Hz-20KHz Speaker sensitivity: 115dB Noise level: less than or equal to -78dBA Dynamic range: greater or equal to 78 dBA Distortion rate THD: less than or equal to 0.1% colour: black Material: Plastic Package Contents: 1 x Headphone 1 x transfer cable 1 x Adapter