The programmable mechanical timer makes your life smarter and more convenient. DIN rail installation, easy to install. Features: Mechanical Timer: Large dial with clear scale; Quartz movement starts automatically within a few minutes after power on. Easy Operation: 24-hour timer, with manual switch, supports program timing (automatically turns on/off according to 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 splash-proof, extends service life. The transparent design has no effect on the viewing of the dial. Widely used: for streetlights, ventilation, fountains, billboards, production equipment, broadcast and television equipment, and more. For use in dry indoor locations only. 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 lighting conditions. Thank you for your 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: Gray Contact Capacity: 16A Power: 2W Frequency: 45-60Hz (AC110-230V) Time Range: 24H Minimum Interval: 30 min Setting Time: 30 min/hour, 48 times Reserve: 150H Contact Resistance: ≤50mΩ Insulation Resistance: ≥100mΩ Item Size: 54 * 68 * 110 mm / 2.13 * 2.68 * 4.33 in Package Size: 11.5 * 7.5 * 6 cm / 4.53 * 2.95 * 2.36 in Package Weight: 192 g / 6.77 oz SUL181d, AC110-230V: Color: White or Gray (sent to random) Power: 1W Frequency: 50-60 Hz Switching capacity: 16A, 250V~, cos φ=1; 4A, 250V~, cos φ=0.6 Incandescent lamp load: 1100W Time range: 24H Minimum interval: 15 min Setting time: 15 min/hour, 96 times Reserve: 200H (230V); 100H (110V) Item Size: 54 * 65 * 90 mm / 2.13 * 2.56 * 3.54 in Package Size: 9.8 * 7 * 6 cm / 3.86 * 2.76 * 2.36 in Package Weight: 135 g / 4.76 oz SUL180a, AC220-240V: Color: Gray Contact Capacity: 16 A Power: 1 W Frequency: 50-60 Hz Load: 1000 W incandescent lamp; 150W Energy Saving Lamp Time Range: 24H Minimum Interval: 15 min Setting Time: 15 min/hour, 96 times Reserve: 72H Contact Resistance: ≤50mΩ Insulation Resistance: ≥100mΩ 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)