Dual High Power LED Lights Super Bright 18 Flash patterns! Power off with memory function. +VDC (Voltage Direct Current or AC DC) to the yellow wire once. To reset the factory default pattern aply +VDC to the yellow wire quickly 3 times. Synchronize two light heads together by connecting the two yellow wires together. For alternating connect the two yellow wires together and let one of the white wires connect to the (Positive) +VDC. Flash Patterns: Random (default) single (split) Quad (Split) Quint (Split) Mega (Split) Ultra (Split) Single-Quad (Split) Single H/L (Split) Single (all) Double (all) Quad (all) Quint (all) Mega (all) Ultra (all) Single-Quad (all) Single H/L (all) Steady 2 (California) Steady 4 (all)