This adjustable-speed strobe is great for parties, projects, as attention grabbers, and a whole lot more! The awesome strobe effect is achieved with super-bright LEDs, and you can control the speed of the flashing anywhere from 1-60 flashes per second! Besides an attention getter it makes a great "pocket strobe" to observe moving parts and rotating machinery. Also features a toggle to switch quickly between fast/slow flashing. Powered by a standard 9V battery (not included). Measures 2.2" x 1.3" x 1.6" From Velleman.