Application
PC with Swyx, Swyx Desktop for macOS (Jabra Evolve 75 UC)
PC with Swyx, Swyx Desktop for macOS, Swyx Phone, Swyx Mobile for iOS (Jabra Engage 65)

Connectivity
Bluetooth, USB (Jabra Evolve 75 UC)
Western, USB (Jabra Engage 65)

Loudspeaker
Stereo (Jabra Evolve 75 UC)
Mono, Stereo (Jabra Engage 65)

Talk Range
Up to 30 m (Jabra Evolve 75 UC)
Up to 150m (DECT), up to 10 m (Bluetooth) (Jabra Engage 65) 

Battery talk time
Up to 13 hours (Jabra Engage 65)

Acoustic
HD-Audio, Noise Cancelling, PeakStop (Jabra Evolve 75 UC)
Hifi sound, Noise Cancelling, PeakStop, Noise@Work, Acoustik Shock (Jabra Engage 65)

Wearing style
Headband

Features
Busylight, leatherette on-ear cushions, hi-fi Sound, active noise cancellation (ANC), bluetooth dual-connectivity, cordless, Listen-in feature (Jabra Evolve 75 UC)
Busylight, intelligent volume control, highest level of call encryption (FIPS 140-2), triple radio density possible (Jabra Engage 65)