This is the perfect item for tow trucks, law enforcement, police, firefighter, EMS, ambulance, private security, or escort service. They are universal fit for all models of vehicles, and they are perfect for windshield. They are perfect for towing, warning, caution, hazard, and emergency use. The control box that comes with this set has 3 flash modes, 1. Very Fast Speed: 8 times then switch 8 times, 2. Normal Speed: Flash 1 time then switch 1 time, 3. Normal Speed: Flash together 1 time, off, flash together again. All flash modes will repeat continuously until manually change mode or turn off.