Miller Engineering Micro Structures Small Rooftop Billboards feature easy-to-assemble etched-metal lattice supports, preassembled electronics, a battery holder and complete instructions.WARNING: This product can expose you to chemicals including Diethylhexl Phthalates, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov