... battery, and its lamp-sourse is LED (light emitter diod).Features:1. Power supply is 4.5Ah ... of maintenance-free, high-energy, long lifetime, light-weight, no leakage, environmental protection and safe.2 ... be switched by the switch ,and the subsidiary light can continue to use for more than 35 ... life.5. Good color-rendering properties of light source and penetrability specialized in dust or fog ...