Aside from the two portable DVD players with screens you also get absolutely everything else you need for this complete set up - the description doesn't really cover all this so here you go:
Two portable players - the screen opens up to reveal the disc space inside
Two remote controls - each powered by two aaa batteries, of which you also get four
Cable to link the two players so both screens can watch one DVD
Two power cables - one for wall charging and one for charging via cigarette lighter in the car
Straps to attach to the back of a headrest
Two pairs of wired headphones
For full features - screen setup etc - you need to use the remote control - you can set up these with the remote and purely play from the player itself (and to be fair the standard setup is pretty decent)
The quality of the screens is very good and with the remote you can set the contrast, brightness, backlight etc and ratio from 4:3 to 16:9 (for older 4:3 ratio DVD), and the sound is decent too though is much better when using wired headphones (the included ones are reasonable enough but if you have a better spec pair then those would be better).
Battery is stated at five hours and as far as I could tell there is no battery level indicator (there may well be on the OSD but I didn't really use that much) and I watched all three of Fulci's Gates of Hell trilogy which is about four and a half hours on the charge that it came with so I think five hours may be understated.
For me, watching a DVD on a massive TV definitely takes away from the overall mood, the flaws are too obvious and it detracts from the enjoyment - the 10" size of this is perfect and shows DVD more in it's original 'quality' from when it first came out - if that makes sense?
You can also use these as monitors to use with Switch etc (using the dock) as it has an HDMI input (but no HDMI included) and this works well, they also play pretty much any region or type of DVD or video file from tf card or USB.
Yes it can be used for car or train journeys etc but for me - this is a low cost DVD player that's helping me get through other region gaps in my collection and I am loving it.