What type of headset will work with the DuraFon-UHF handset? EnGenius Admin Updated April 05, 2018 01:32 Follow The connector on the handset is M1 (2.5mm). Related articles EnGenius in the past was designing a repeater to extend the range even further, is there any update on the availability? Is Bluetooth functionality on the roadmap? (Durafon-UHF) How to use EnGenius SN-ULTRA-AS? Comments 0 comments Please sign in to leave a comment.