This is a portable Military runway light that is powered by up to 4 six volt lantern batteries. The switch is a 3 way, off, on, and on flashing. It is from the Vietnam and Cold War era and was used in emergency and portable field operations. If a landing strip had to be set up remotely, these lights are what outlined the runway. It comes with 4 colored lenses and a shield for when stealth or covert operations were necessary. this is an excellent period collectable for a military or aviation enthusiast or to place in the man cave. It is about the size of a six pack of soda. Buyer is responsible for shipping cost.