Dennis Absolutely not . Xiaomi doesn't support HDMI over USB C. I have the phone and monitor, so first answer is wrong .

Dennis only if your smartphone can send out HDMI over USB. most don't except high end Samsung and Huawai.

Dennis No but you can power with an external battery. However in this case you still need a source of graphics and source may provide power.

Dennis As a multiple Xiaomi phone owner I can assure you it doesn't. Xiaomi on all but one phone doesn't send graphics over USB. My Lenovo tablet works fine however.

Dennis Absolutely not; Xiaomi doesn't support HDMI out over USB and thus doesn't work on my Xiaomi phones. Basically only high end Samsung and Huawai do this. I have a 9 that doesn't work but a Lenovo tablet that does.

Dennis it won't connect unless you have an expensive phone which features USB C to HDMI.

Dennis No; most Xiaomi phones, including this one, don't send out HDMI over USB C which is the only way it will function.

Dennis Most phones do not send HDMI out over USB C and thus don't work. A few expensive phones do but most, including Xiaomi, do not. My high end Lenovo tablet does and works but none of my phones can connect. Be careful and check if your phone sends out HDMI. If a USB to HDMI cable works from your phone to your TV it will connect to this monitor if it doesn't you are out of luck. The monitor is basically dumb but will connect fine to a mini PC for example and you can usually power both with a battery pack.