Key Specifications/Special Features:Solar power: 0.2W Built-in battery 1#: Ni-MH 1.2V/1,000mAh, life time: 3 5 years Built-in battery 2#: could choose special storage capacitor from Korea, life time >10 years Special Feature: battery inside can be replaced to prolong life-time without damage stud View distance: >1,000m LEDs type: super LED, 2-piece on each side, total 4 pieces LEDs emission: Yellow (could change according to the requirement of clients) Heat resistance: -25 to +75 degrees Celsius Auto-light control, and continuous working under cloudy and rainy time: 12 15 days Resist compression: >30MTLight intensity: 6,000 to 10,000mcd Light mode: flash, 100 times per minute (could be changed)