1. Big capacity high performance nickel hydrogen battery is used. 2. With very high safety Main technical specifications 1. Rated capacity 7Ah 2. Nomial voltage 3.6v 3. Lighting times more and equal 11H 4. LED light source A. Rated voltage 4.2V B. Current of main light source 700MA C. Current for auxiliary light source 5. Maxi lightness at 1M A. Begin lighting 900LX B. Lighting 11 h 500LX 6. Weight 800g 7. Nos of battery cycle 500 times