Sold as 1 Each. Headset for everyday use with Windows/macOS computers and laptops. Captures audio cleanly at frequencies of 150Hz-6.8kHz and 41dB sensitivity. Noise-canceling technology blocks up to 80% of background noise. Provides reliable wired connectivity. Maximum microphone impedance: 64 ohms. Built-in circuit breaker type protection against sudden volume spikes from the speaker. Black on-ear design with high-comfort ear pads. Microphone arm rotates 360 degrees, so you can have it on either left or right side. In-line controller has volume up/down and microphone mute buttons. Leatherette-covered ear cushions for comfort and durability. Powerful 40mm speakers and digital signal processing for quality sound. Compatible with Zoom, Skype, Skype for Business, 3CX, and other conferencing apps.