These are four used count sensor boards that were attached to the fully automatic mahjong table Amos Gaban. Since they were removed from a non-working table, their operation has not been confirmed. However, judging by the color of the boards, they appear to be early models from over twenty years ago. They might work as is, but it would be best if someone with knowledge purchased them with the intention of repairing them (such as replacing the photo sensors). Returns will not be accepted after shipping. Please only purchase if you understand and agree to this.