This product just didn't work - something about the design was VERY flimsy. I put the card in the viewport and was able to switch to the next frame by turning the lever down 4-5 times. Then it got stuck, I corrected the map, but it didn't help. I tried two other cards and the lever could be pressed but the image would not advance. Super disappointing. I was really looking forward to sharing this nostalgic memory with my daughter as a gift.