Hi Paul,
To answer your last question first. Yes, touchscreens have 2 connections. One for the Monitor part, and one for the Mouse part of the touchscreen.
The first one (
150147211964) says in the title 'PC INTERFACE', and does not say USB. So, I'm guessing that maybe it does not use a USB port for the mouse, and only uses mouse port? Since most pcs only have 1 mouse port, your other mice would have to be USB probably. Not a problem in general, but that would limit me. But if that's ok with you I guess it works. Also, I have not seen anybody with a touchscreen that does not use USB ports as the interface for the mouse, so I really cannot tell you much more on that.
Also, I don't see where this one mentions it's Native Resolution. I would go with a Native Resolution of 800x600 if I could find one. Have you read the threads in our FAQ section?
The second one (
130139526727) does have a lot of info about it. And it says it uses a USB for the Mouse, 800x600 Native Res, VGA PC Input, ect...
Also, several users have bought touchscreens from HK and I have not seen any posts of any problems with the purchase, delivery, or functionality.
Good Luck with your choice...
WBK