It's the traditional way to wear infrared contact lenses or sunglasses to see the marks on the back of marked cards, mahjong, Domino and Paigow. Now there is a different way to check the invisible marks with this new product, the leather belt camera.
With a new special kind of ink, we can mark the poker cards or dominoes with a new ink mark that no lenses or sunglasses can check. Only the belt camera can scans the marks. After it sends the signal to the receiver, the screen such as a phone or TV can show you the marks clearly.
For every leather camera to see marked cards, there is certain distance between the camera of the belt and the marked cards or marked mahjong. Please tell me exactly your requirements about the distance so that we can get the right one or customize a special one for you.