Sold as 1 Each. Built-in sound chip, allowing direct plug-n-play with a simple USB Connection. Noise cancelling technology filters out unwanted noises from the background. Earcup and headband are adjustable to ensure the perfect fit, while the custom padding provides a soft comfortable fit. Easily adjust the volume and manage your calls at your fingertips. Adjustable microphone is omni-directional, and 270 degrees adjustable.