environmental protection type, no need of battery high-luminance led light. no need of repiacement easy charging, 15-30 seconds of shaking provides continuous lllumination of 5 minutes highly sealed, all-weather water-proof. please keep the toech away from electrical appliances like tv. computer etc so as to protect the torch from the disturbance wave radiated by the appliances. please do not switch on the torch during charging of the first time,please note that minimum charging time is 15-30 seconds. please do not put the torch under sun light for a long time. please do not use the torch in places of high temperature or high humidity. product size: 29*5.3*5.3 cm pcs/ctn: 40 pcs net weight: 13.6 kg gross weight: 14.6 kg carton size: 52.2*32*33.5 cm