1.can be used as a headset
A headset is one headphone or pair with a built-in microphone. Headsets can be used for apps that require communication i.e. Skype, games with voice chat, mobile phones, etc.
You can use your voice to control key functions of the device and you can easily access your device without pushing any button.
3.control panel placed on a device
There is a control panel on the device body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.
This is a monaural device which could be used for both ears.
Multipoint allows you to link to more Bluetooth devices and switch between them. For example you can easily switch calls from one device to another without having to manually disconnect and reconnect.
The device has an option to mute/unmute a conversation directly from the device.