Choosing one it's a bit confusing, Asus offers many models, and hard to understand the difference. There are some which have separate display port and power. Different covers. With a battery etc. I really wanted just one having only one cable.
On Amazon there are some other less/not known brands, offering bigger screens, but I felt more convinced by the mainstream brand.
Remember that your laptop has to support this. I tested it with an older MacBook Pro, and Lenovo ThinkPad. On my old Ideapad I don't have such port.
Right now I'm at a co-working space and I have: - My MacBook on a stand to the left - My Asus ZenScreen to the right - The monitor the coworking space provides at some desks (If you get there in time before it's taken, lol) in the middle
Pretty great setup to know I'll have 3 screens and barely need to pack anything when I come in.