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By certification 
Put hidden lens inside of wall picutres,it can scan backside marked cards.The user can see what is the card it is through computer and TV.
Used for:
The lens can adjust right,left,up and down. Also can adjust Zoom + and Zoom -.
Distance: Maximum 3 Meters.
Used for:
The lens can adjust right,left,up and down. Also can adjust Zoom + and Zoom -.
Distance: Maximum 3 Meters.
