1Mechanical Timer Switch: Large dial with clear scale; quartz movement starts automatically in a few minutes after the power is switched on. 2Easy Operation: 24 hours timer, with manual switch, supports program timing turn on/ off automatically according to the schedule and permanent ON/ OFF. Built-in battery for reserve. 3DIN Rail Installation: Convenient to assemble and disassemble, flexible to use. Compact size and light weight make installation easier. 4Transparent Dust Cover: Dustproof and water-splash proof, prolongs service life. Transparent design has no effect on viewing the dial. 5Wide Use: For street lights, ventilation, fountains, advertising hoarding, production equipment, broadcasting and television equipment and more. Only for use in dry indoor places.