This programmable mechanical timer makes your life smarter and more convenient. DIN rail installation, easy to set up. **Features:** Mechanical Timer: Large dial with a clear scale; the quartz movement starts automatically a few minutes after power is turned on. Easy Operation: 24-hour timer, with manual switch, supports program timing (automatically turns on/off according to schedule) and permanent on/off. Built-in battery for backup. DIN Rail Installation: Convenient to mount and dismount, flexible to use. Compact size and lightweight make installation easy. Transparent Dust Cover: Dustproof and splash-proof, extending service life. The transparent design has no effect on viewing the dial. Wide Application: For street lights, ventilation, fountains, billboards, production equipment, broadcasting and television, and more. For use in dry indoor environments only. **Please Note:** 1. Installation must be performed by a qualified electrician. 2. Read the user manual carefully before use. 3. Size and color may vary slightly due to manual measurement and different lighting conditions. Thanks 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: 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 Backup: 150H Contact Resistance: ≤50mΩ Insulation Resistance: ≥100mΩ 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 (Random Delivery) Power: 1W Frequency: 50-60 Hz Switching Capacity: 16A, 250V~, cos φ=1; 4A, 250V~, cosφ=0.6 Incandescent Lamp Load: 1100 W Time Range: 24H Minimum Interval: 15 min Setting Time: 15 min/hour, 96 times Backup: 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: Color: Gray Contact Capacity: 16 A Power: 1W Frequency: 50-60 Hz Load: 1000 W Incandescent Lamp; 150W Energy-Saving Lamp Time Range: 24H Minimum Interval: 15 min Setting Time: 15 min/hour, 96 times Backup: 72H Contact Resistance: ≤50mΩ Insulation Resistance: ≥100mΩ 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 / 2.98oz **Package List:** 1 * Timer Switch 1 * User Manual (English)