Certified for Skype and Business. Compatible with Linux, Mac and Windows. Acoustic echo cancellation, a noise-cancelling mic, and digital signal processing (DSP) block out unwanted noise for clear conversations with great sound quality. Leatherette ear pads, plus padded headband with metal reinforcement provides strength and flexibility. Mono speaker output. 2-year warranty. 17.2 x 5 x 16.5cm. Black.