RUPSE 16 Watt 4x4 LED Emergency Vehicle Strobe Lights for Front Grille/Deck,Yellow Interchangeable/Compatible with: All automobiles and devices equipped with a 12V power source. Each light unit has 4x1 watt LED'S.These are very bright! Each unit measures 95mmx30mm This set includes 4 lihgt units & A ON/OFF switch that can be mounted anywhere in the vehicle. Flash Mode A- Light blocks 1, 2 flashes rapidly for 2 times, followed by light blocks 3, 4 flashing rapidly for 2 times. Repeats continuously.