Feature: Mechanical chronograph: large dial with clear scale; quartz movement will automatically start within a few minutes after power on. Easy to use: 24-hour timer with manual switch, supports automatic on/off timing according to schedule: and permanent on/off. Built-in backup battery. DIN rail installation: easy disassembly and assembly, flexible use. Small size, light weight, easy installation. Transparent dust cover: dustproof and splashproof, extending the service life. Transparent design does not affect the viewing of the dial. Wide range of uses: used in street lamps, ventilation, fountains, billboards, production equipment, radio and television equipment, etc. For dry indoor locations only. Pay attention: 1. Installation should only be carried out by a qualified electrician. 2. Please read the user manual carefully before use. 3. Due to manual measurement and different lighting conditions, the size and color may vary slightly. Thanks for your understanding. Feature: 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 Grey Contact Capacity: 16A Power: 2W Frequency: 45-60Hz AC110-230V: Time Range: 24H Minimum Interval: 30 minutes Setting time: 30 minutes/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 x 7.5 x 6cm / 4.53 x 2.95 x 2.36in Package weight: 192g / 6.77oz SUL181d, AC110-230V: Color: white or gray random delivery: Power: 1W Frequency: 50-60 Hz Breaking capacity: 16A, 250V~, cos=1; 4A, 250V~, cos=0.6 Incandescent load: 1100 W Time range: 24H Minimum interval: 15 minutes Taking time: 15 minutes/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 * 2.36in Package weight: 135g / 4.76oz SUL180a, AC220-240V: