The Kensington HiFi headset combines great wearing comfort with robust design. The maximum volume is limited to 94 dB so that you can hear safely despite loud audio. - 40 mm on-ear speaker with deep bass - Noise-cancelling microphone, volume and mute controls - Cross-device compatibility - Mic boom can be rotated up to 270° Please note: The headphones are available with a choice of 3.5 mm jack or USB-A connector.