Hi, @jarnix2 - Thanks for letting us know, we'll try and be clearer next time! The main differences in the range are below: Jabra Speak2 40 =Wired USB (A&C), No Bluetooth, 50mm Speaker Jabra Speak2 55 = Wired USB (A&C), Bluetooth 5.1 (USB Bluetooth Dongle Sold Separately), 60mm Speaker Jabra Speak2 75 = Wired USB (A&C), Bluetooth 5.1 (USB Bluetooth Dongle Included), 60mm Speaker Thanks, Dale