I bought the pack of 3 displays, a display in 2 son works and the other 2 have 3 son, one red, one yellow, one black ... if I plug red and black, 2 digits are illuminated with 2 zero , yellow and black nothing, no leaflet nonconforming product that I asked, product quality, to see the long, but from the comments, it does not slap mal.J'ai contacted vendor to find out what this yellow son, for now no answer and I think I never have, delivery wait at least 1 month mini, envelope or was the product was all crumpled as if it were dropped into water and then dried.