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 automatically starts a few minutes after the power is turned 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 compatible 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 splashproof, prolong the service life. The transparent design has no effect on the viewing of the dial. WIDE USAGE: compatible street lights, ventilation, fountains, billboards, production equipment, broadcast and television equipment and more. Only compatible use in dry indoor locations. Note: 1. Installation should only be carried out by a qualified electrician. 2. Please read the user manual carefully becompatiblee use. 3. Size and color may be slightly different due to manual measurement and different light conditions. Thank you compatible 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 SUL181h NI-MH Battery: AC110- 230V/DC 12V Color: Gray Contact capacity: 16A Power: 2W Frequency: 45-60Hz (AC110-230V) Time range: 24H Minimum interval: 30min Setting time: 30min/hour, 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 gray (randomly sent) Power: 1W Frequency: 50-60 Hz Switching capacity: 16 A, 250 V~, cos =1; 4A, 250V~, cos=0.6 Incandescent lamp load: 1100W Time range: 24H Minimum interval: 15min Setting time: 15min/hour, 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 * 2.36 inch Package weight: 135g / 4.76oz SUL180a, AC220-240V: Color: Gray Contact capacity: 16A Power: 1W Frequency: 50-60Hz Load: 1000W incandescent lamp; 150W energy saving lamp Time range: 24H Minimum interval: 15min Setting time: 15min/hour, 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 / 2.98 oz Package List: 1 * Timer Switch 1 * User Manual (English)