Single-sided Business Headphone: Compare with Mpow 071 USB headset, this 323 computer headset adopts the single-sided design, which is ideal for having an open ear to your surroundings on desktop calls Noise Cancelling Boom Design: The 270 degree rotatable boom mic ensures precise positioning and optimal noise cancellation, staying clear of the customer service representative's peripheral vision while helping ensure that customers hear every word; Also, you can wear it on the left or right ear as you like All Day Comfort: Made from high-grade ABS materials and soft protein ear cushions, Mpow skype headset provides the customer service representative with an ultra-lightweight fit; It's comfortable enough to wear all day, on your longest calls, especially for Telephone-intensive users, including formal customer care centers, help desks, telesales, and customer service organizations Wide Compatibility: USB and 3.5 mm connectivity options let you work on a variety of devices; Compatible with Windows 2000/7/8/10/XP/Vista, Mac OS X, iOS, Android, Tablet PC; Note: Please choose USB connection if you wanna mute function (94)