In order to make the LED sheet work, 24V transformer is totally necessary.
LED and thicker PCB board, under microscope, you can check we use gold thread to connect the LED chip, other suppliers use silver thread. Gold is more stable than silver. Our PCB board is thicker, the surface is 35um, the back is 70um, other supplier is only 25um and 25um.
We have professional USA local engineer to supply installation coach, we can design the layout and circuit diagram free.
Working life time 50,000 hours. IP 20, not water proof
What inside package: 4pcs led panel,total 5sqf, 8 pcs short connect line each is 3 inch length, 8 pcs long connector line each is 8inch, 1 installation manuals, 24 pcs spacer. Transformer and controller is not included, need to buy separately.