... ,as the best helpful tool when meeting emergent situation.4.FM radio ,search the programme automatically ,with loud and clear speaker , adopt ... 90-120 minutes with 5 V ),flashlight can work for 2 hours , radio can work for 90 minutes , siren can work 45 ... place, otherwise will cause circuit impassable.Please keep constant speed (2 winds/sec) when hand cranking; overexerted power will damage the ...