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; the quartz movement starts automatically a few minutes after power on. Easy operation: 24 hours 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 easy. Transparent dust cover: dustproof and splash-proof, extends service life. The transparent design has no effect on the viewing of the dial. Wide use: for street lights, ventilation, fountains, billboards, production equipment, broadcast and television equipment and more . Only for use in dry indoor locations. 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. Features: 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: 16 A 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: 50m Insulation resistance: 100m Item Size: 54 * 68 * 110 mm / 2.13 * 2.68 * 4.33 inch Package size: 11.5 * 7.5 * 6 cm / 4.53 * 2.95 * 2.36 inch Package Weight: 192g / 6.77oz SUL181d, AC110-230V: Color: white or gray (sent randomly) Power: 1W Frequency: 50-60 Hz Switching capacity: 16A, 250V~, cos =1; 4A, 250V~, cos=0.6 Incandescent lamp load: 1100 W 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 inch Package size: 9.8 * 7 * 6 cm / 3.86 * 2.76 * 2.36 inch Package Weight: 135g / 4.76oz SUL180a, AC220-240V: Color: Gray Contact capacity: 16 A Power: 1W Frequency: 50-60 Hz Load: 1000 W incandescent lamp; Energy saving lamp 150W Time range: 24H Minimum interval: 15 min Setting time: 15 min/hour, 96 times Reserve: 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)