Signatrol model 24-B-44 flasher is a 4 circuit, heavy-duty flashers with adjustable speed options constructed of high quality materials. It carries the same function as the model 20 counterparts but in a slimmer design and prewired with an easy to connect terminal board. The model 24 design features contact stacks that can be easily detached and replaced with a screw driver with no need to remove the unit from its cabinet. Heavy-duty silver alloy contacts of one half Inch Dia provide for maximum life where only wiping the contacts assures positive operation. Ball-bearings throughout provide smooth operation and are sealed with aluminum covers to guard against dust and moisture. These enduring designs can be depended on for years of reliable service even in the most demanding allocations.