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 minutes after power on. Easy Operation: 24-hour timer, with manual switch, supports schedule timing (automatically turn on/off according to schedule) and permanent on/off. Built-in battery for backup. DIN rail installation: convenient to assemble and disassemble, flexible to use. Compact size and light weight change the installation. Transparent dust cover: dustproof and splashproof, prolong the service life. Transparent design has no effect on dial viewing. Wide Use: For street lights, ventilation, fountains, billboards, production equipment, broadcast and TV 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: Grey Contact Capacity: 16 A Wattage: 2W Frequency: 45-60Hz (AC110-230V) Time range: 24H Minimum Interval: 30 min Setting time: 30 min/hour, 48 times Reserve: 150H Contact Resistance: 50m Insulation Resistance: 100m Item Size: 54 * 68 * 110 mm / 2.13 * 2.68 * 4.33 inch Package size: 11.5*7.5*6cm / 4.53*2.95*2.36inch Package Weight: 192g / 6.77oz SUL181d, AC110-230V: Color: white or gray (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: 15 min Setting time: 15 min/hour, 96 times 200H (230V); 100H (110V) Item Size: 54 * 65 * 90 mm / 2.13 * 2.56 * 3.54 inch Package size: 9.8 * 7 * 6 cm / 3.86 * 2.76 * 2.36 inch Package weight: 135g / 4.76oz SUL180a, AC220-240V: Color: Grey Contact Capacity: 16 A Wattage: 1W Frequency: 50-60Hz Load: 1000W incandescent lamp; Energy saving lamp 150W Time range: 24H Minimum Interval: 15 min Setting time: 15 min/hour, 96 times 72H Contact Resistance: 50m Insulation Resistance: 100m Item Size: 18 * 65 * 90 mm / 0.71 * 2.56 * 3.54 inch Package size: 9.8 * 7 * 2 cm / 3.86 * 2.76 * 0.79 inch Package weight: 85g / 2.98oz Package List: 1 * Timer Switch 1 * User Manual (English)