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By certification 
Function:
When we play card games, we can know the hold cards in advance. Put the cards on the table and set up our hidden lens under the table. The cards can be seen in another room by the display device. For example, we can install the lens in the shoes or in the back of the table plate. All the things on the table can be seen by the display device.
When we play card games, we can know the hold cards in advance. Put the cards on the table and set up our hidden lens under the table. The cards can be seen in another room by the display device. For example, we can install the lens in the shoes or in the back of the table plate. All the things on the table can be seen by the display device.
