Programmable mechanical timer switch makes you life smarter and more convenient. DIN rail installation, easy to install.Features:Mechanical Timer Switch: Large dial with clear scale; quartz movement starts automatically in a few minutes after the power is switched on.Easy 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.DIN Rail Installation: Convenient to assemble and disassemble, flexible to use. Compact size and light weight make installation easier.Transparent Dust Cover: Dustproof and water-splash proof, prolongs service life. Transparent design has no effect on viewing the dial.Wide Use: for street lights, ventilation, fountains, advertising hoarding, production equipment, broadcasting and television equipment and more. Only for use in dry indoor places.Note:1. Installation should only be carried out by a qualified electrician.2. Please read the user manual carefully before use.3. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding.Specifications:Model, Voltage: SUL181h, AC110-230V/SUL181h, DC12V/SUL181d, AC110-230V/SUL180a, AC220-240V (Optional)Material: ABSBuilt-in Battery: 1.2V 40mAh NI-MH BatterySUL181h: AC110-230V/ DC 12VColor: GreyContact Capacity: 16APower: 2WFrequency: 45-60Hz (AC110-230V)Time Range: 24HMinimum Interval: 30minSetting Times: 30min/time, 48 timesReserve: 150HContact Resistance: 50mInsulation Resistance: 100mItem Size: 54 * 68 * 110mm / 2.13 * 2.68 * 4.33inPackage Size: 11.5 * 7.5 * 6cm / 4.53 * 2.95 * 2.36inPackage Weight: 192g / 6.77ozSUL181d, AC110-230V:Color: White or Grey (Randomly Sent)Power: 1WFrequency: 50-60HzSwitching Capacity: 16A, 250V~, cos =1; 4A, 250V~, cos =0.6Incandescent Lamp Load: 1100WTime Range: 24HMinimum Interval: 15minSetting Times: 15min/time, 96 timesReserve: 200H (230V); 100H (110V)Item Size: 54 * 65 * 90mm / 2.13 * 2.56 * 3.54inPackage Size: 9.8 * 7 * 6cm / 3.86 * 2.76 * 2.36inPackage Weight: 135g / 4.76ozSUL180a, AC220-240V:Color: GreyContact Capacity: 16APower: 1WFrequency: 50-60HzLoad: Incandescent Lamp 1000W; Energy-saving Lamp 150WTime Range: 24HMinimum Interval: 15minSetting Times: 15min/time, 96 timesReserve: 72HContact Resistance: 50mInsulation Resistance: 100mItem Size: 18 * 65 * 90mm / 0.71 * 2.56 * 3.54inPackage Size: 9.8 * 7 * 2cm / 3.86 * 2.76 * 0.79inPackage Weight: 85g / 2.98ozPackage List:1 * Timer Switch1 * User Manual (English)