Jabra Engage 55 Headset - Mono - USB Type AJabra Engage 55 Headset Mono USB Type A Wireless DECT 492. 1 ft (150 m) 40 Hz to 16 kHz On ear Monaural Open Noise Cancelling, Uni directional, MEMS Technology Microphone Black VPN: 9553 455 125 SKU: AC503247 UPC: 185B6A Open back headset gives you a more speaker like listening experienceBoom mic lets you chat with your friends & family on Skype and on multiplayer network gamesHear low subs and soaring vocals with a frequency range of sound from 40 Hz