This 4 in 1 multi car tools main purpose for trouble warning in night, survival in accident and ordinary flashlight. Keen and firm harmmer used for breaking window in bad situation. Cutting knife was used for cutting seat belt to survive. Flashlight in front has independent switch supplies constainable lighting. Warning light by red Led signals in the body of hammer with magnetic base attched in the car to give an alarm. Attention the influence of product magnetism and loaded the battery before usage.Battery provided for yourself please.