Jabra Engage 75 Mono Headset On Ear Wireless Dect (9556-583-111) (JAB9556-583-111)

Speaker frequency range 40 Hz-16 kHz Talk-time up to 9 hours Connectivity Deskphone, USB deskphone, softphone, 2x mobile (Bluetooth) Connection (mini jack, USB, etc.) 2x micro USB, RJ-9 for handset, RJ-9 for deskphone audio, RJ-45 for AUX NFC