Characteristics: 1 Bicycle enthusiasts top equipment have a fever was recommended to buy!; 2 The 2 ultra bright America CREE XM-L T6 LED color temperature of 5000K the highest luminous flux of 1600 lumens designed specifically for cycling and mountaineering lovers. 3 Power: the battery pack with capacity of 4400mAh (4 x 18650) 2 and 2 on design to provide power backed by powerful; 4 High current charger charger with overcharge protection and temperature protection short circuit protection intelligent fast charging fully charged automatic stop parameters are as follows: input: AC 100~240V 50/60Hz output: DC 8.4V / 1.8~2.8A 5 IC 3 files dimming circuit. Constant current always is a kind of high brightness no electricity will go out and unlike step-down circuit will slowly go dark. 6 Connection line is the use of 3.5mm in diameter very durable the interface is very strong. 7 after the switch: 4 on 1 off green lit: 100~65% power red: red flashing 65~30% power: 30% of the power; 8 Aluminum alloy vacuum plated with a light reflecting cup 90 degrees angle used for riding. Perfect match; 9 Waterproof: IP-6 rain completely free riding. 10 Applicable to all bicycles very simple and easy to use. 11 a 360 degree rotating lamp holder assembly and disassemble is more convenient firm let you ride more secure. 12 switch to the 4 opening and closing design one is light 2 file 3 file light weak light 4 stops flashing