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: ABS Built-in Battery: 1.2V 40mAh NI-MH Battery SUL181h: AC110-230V/ DC 12V Color: Grey Contact Capacity: 16A Power: 2W Frequency: 45-60Hz (AC110-230V) Time Range: 24H Minimum Interval: 30min Setting Times: 30min/time, 48 times Reserve: 150H Contact Resistance: 50m Insulation Resistance: 100m Item Size: 54 * 68 * 110mm / 2.13 * 2.68 * 4.33in Package Size: 11.5 * 7.5 * 6cm / 4.53 * 2.95 * 2.36in Package Weight: 192g / 6.77oz SUL181d, AC110-230V: Color: White or Grey (Randomly Sent) Power: 1W Frequency: 50-60Hz Switching Capacity: 16A, 250V~, cos =1; 4A, 250V~, cos =0.6 Incandescent Lamp Load: 1100W Time Range: 24H Minimum Interval: 15min Setting Times: 15min/time, 96 times Reserve: 200H (230V); 100H (110V) Item Size: 54 * 65 * 90mm / 2.13 * 2.56 * 3.54in Package Size: 9.8 * 7 * 6cm / 3.86 * 2.76 * 2.36in Package Weight: 135g / 4.76oz SUL180a, AC220-240V: Color: Grey Contact Capacity: 16A Power: 1W Frequency: 50-60Hz Load: Incandescent Lamp 1000W; Energy-saving Lamp 150W Time Range: 24H Minimum Interval: 15min Setting Times: 15min/time, 96 times Reserve: 72H Contact Resistance: 50m Insulation Resistance: 100m Item Size: 18 * 65 * 90mm / 0.71 * 2.56 * 3.54in Package Size: 9.8 * 7 * 2cm / 3.86 * 2.76 * 0.79in Package Weight: 85g / 2.98oz Package List: 1 * Timer Switch 1 * User Manual (English)