... from Japanese airlines tighten technology,stainless steel,shakeproof,rust-proof,water proof.6. Energy saving,high brightness,long lifespan,adopted ... Engineering vehicles: excavator, dozer, road roller, bulldozer, crane and mining truck etc.2. Special vehicle: fire engine, police ... truck, Fork lift, trains, boat, bus, and tanks. Functions : One negative and one positive wire to connect 9-30vdc power ...