2 screen separate from the notebook. you plug in 2 -USB C ( 1 port per screen ) and than you can use both screen. U can use also 1 screen only if you dont need both screens. It is not big, but can be handy when you are at travel and need more screen. I travel a lot with it and use it extensively, but it is true that it is not replacing widescreen monitor.

Pro:
- very mobile, all can fit in a 15" notebook sleeve, can improve productivity on the road
- easy installation with Windows, just plug in the cables and works
- sufficient accessories in the base package. ( multiple extension cables, really generous, no need to buy anything else )

Cons:
- 10" is not much,
- screen back-ground light is not too bright. I use it with an high quality notebook screen and it is darker, but still readable.
- price

Other:
- you must have at least 2 USB - C port free to run both screens. ( or USB normal with a port adaptor )

Right!!!
But I personally find the 10" monitors much too small. I couldn't work with Word/Excel - so I returned the whole thing.