Yes, battery operation and mains operation are possible.

Does it come with the USB cable and plug?

Yes it comes with USB cable. I don't think it came with any kind of mains plug.

Can you turn off the display at night so the light does'nt disturb?

You touch the screen to brighten the screen to read it. After 30s it goes so dark you can’t read it. I don’t think the brightest is an issue the rest of the time. Even at night.

Manufacturer	Newentor
Package Dimensions	14.3 x 12.6 x 3.7 cm; 155 g
Colour	Black
Style	Pack of 1
Power Source	Battery Powered
Batteries included?	No
Batteries Required?	Yes
Item Weight	155 g

CO2 Monitor, Air Quality Monitor Indoor Carbon Dioxide Detector with Voice Alert Large Display, Temperature Humidity, Alarm Clocks for Home, RV, Office, Classroom, 400-5000ppm, Black

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