Main Technical Parameters: Lighting: Max. Luminous flux 5.5 Lm Max. brightness 30000 Mcd High-luminance lighting time after 1 minute cranking 20 Minute High-luminance lighting time after being charged fully 2.5 Hour Main parts lifespan: Switch 5000 Time The whole unit 5 Year The plastic part 5 Year Others : The specification of the built-in battery 40 mAh, 3.6V