Jabra Engage 55 SE MonoJabra Engage 55 SE Mono Microsoft Teams Certification Mono USB Type C Wireless DECT 492. 1 ft (150 m) 40 Hz to 16 kHz Over the ear, On ear Monaural VPN: 9653 470 125 SKU: AC443602 UPC: Loading Your voice will be heard loud and clear with the boom microphone Listen to deep lows and euphoric highs with a frequency range of sound from 40 Hz 16 kHz Listen to your tape recordings or use them when listening to telephone calls on Skype with these mono sound