Specifications:Size:80mm*20mm*15mmMaterial:plastic+silica gel  Flash Light 6 Modes (Single Head Light):Standard/High beam/Over drive/50% brightness/100%brightness flashing/ strobe flashingBattery capacity:500MAH lithium cellLife time:100000 hoursWaterproof:IPX-5 Features:Using high brightness and energy saving led lampsLess power consumption and longer service lifeUSB intelligent full of electric power systemSustainable use of 5 hours lighting,only 1-2 hours chargingCan be used as usual in a rainy dayPackage Included:1xTail Light1xSilica Clasp1xUSB CableNO Retail Box. Packed Safely in Bubble Bag.