The dehumidifier extracts 400ml per day and has a 1.5L capacity tank which switches off when full.
Compressor uses thermoelectric Peltier module
Product dimensions: 34 x 20.5 x 13cm
I wouldn't be at all surprised if these units are 12V with a mains adaptor - it doesn't say this though.
I used a dehumidifier in my van a lot as I was sleeping in it 4 days a week last Winter while in College. It is stunning to realise how much perspiration we give off each night! (and that's just me on my own !)