The device can connect at a greater distance via Bluetooth or infrared to another device.
Sena SMH10 Motorcycle Headset & Intercom: 900m
16. has an on-ear form
This device comfortably rests on top of your outer ears. As it doesn't block out everything from the outside world, it's preferred in places like office environments and recommended for outdoor activities.
Sena SMH10 Motorcycle Headset & Intercom
9% have it
17. has a wind noise reduction microphone
The microphone reduces the sound of wind as it blows past device and disrupts the voice clarity.