in fact, except the contact lenses with marked cards and poker scanner with edge bar-code marked cards, we have also the IR marked decks. the IR marks on the marked playing cards,only for IR camera to read.

the detector that can see the normal infrared marked cards couldn't detect this special IR marked cards either. Thus you don't need to worry about being detected by others' contact lenses or sunglasses when playing pokers with these marked cards. with a IR camera installed in everyday items, you can see the marked cards clearly on a screen.

as for the working system of the IR camera, it is not the farther the better. It would be better to tell us the distance between the poker cards and the position you want to install. so we could recommend you the suitable monitoring distance.

Distance:
1-5M

Type:
Music box,wall picture,air condition,lamp,clock,TV and etc.

Feature:
the lens can be moved from up,down,left and right.