Instructions:Push the plug out when charging and insert it directly in 5V socket・ and charge indicator will be light. full charging time needs 2 - 3 hours.while using・ press the button for transforming 3 modes in turns.The flashlight can be lighted continuously for about 12 hours at low brightness・ for 2 - 3 hours at high brightness.Attentions:When the light is dim・ please charge it immediately (please keep charging once every two months). otherwise it will affect the life seriously.do not use it when charging. otherwise it would burn the electric elements.