The 12v strobe light is magnetic, which makes it easy to install and move around as needed. It is suitable for use in different industries, including construction, mining, and transportation. Whether you need to signal a warning or alert people in an emergency, this strobe light is an excellent choice. It has a magnet attached and can also be permanently attached, the 12v power plug has a on/off switch . Used but very good working condition FREE SAME DAY SHIPPING