Jabra Evolve2 30 SE Mono Product Overview: 2 built-in microphones Advanced 2 microphone technology ensures clear voice transmission and outstanding call performance Integrated busylight Automatic busylight lights up to signal ‘do not disturb’ when you’re on a call, and can also be enabled manually 28mm speaker Superior 28mm speaker deliver outstanding audio for both calls and media playback Noise-isolating design Memory foam ear cushion and ergonomic design ensure great noise isolation from the moment you put it on