Describe The programmable mechanical timer makes your life smarter and more convenient. DIN rail installation, easy installation. Feature: Mechanical chronograph: Large dial with clear scale; Quartz movement starts automatically within a few minutes after power on. Easy to use: 24-hour timer with manual switch, supports timing (automatically turn on/off 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 splash-proof, extending service life. The 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. Thank you 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 Gray Contact Capacity: 16A Power: 2W Frequency: 45-60Hz (AC110-230V) Time Range: 24H Minimum Interval: 30 Minutes Setting Time: 30 Minutes/Time, 48 Times Reserve: 150H Contact Resistance: 50m Insulation Resistance: 100m Item Size: 54 * 68 * 110mm / 2.13 * 3.13 * 0.39in 2.68 * 4.33 inch Package Size: 11.5 x 7.5 x 6 cm / 4.53 x 2.95 x 2.36 inch Package Weight: 192 g / 6.77 oz 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 Setting 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: Gray Contact Capacity: 16A Power: 1W Frequency: 50-60Hz Load: 1000W Incandescent Lamp; 150W energy-saving lamp Time range: 24H Minimum interval: 15 minutes Setting time: 15 minutes/hour, 96 times Reserve: 72H Contact resistance: 50m Insulation resistance: 100m Product 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 Packing list: 1 * Timer 1 * User manual (English) Main points: 1. The product size is measured manually, there may be some errors 2. Since different monitors display different colors, please refer to the actual color you received. 3. Please confirm the size before purchasing. 4. After receiving the package, if there is any dissatisfaction, please contact me first, do not leave a bad review easily, thank you, I wish you a happy and become very rich.