SecurityIng&reg; Outdoor 3X T6 LED 3800Lm LED Bicycle Light Super Bright Bike Headlight with 8.4V 4400mAh Rechargeable Li-ion Battery Pack & Charger Applies the high efficient booster circuit to internal wiring. Working voltage is wide and can utilize the batteries to the largest extent. Intelligent circuit control, 4 switch modes, maximum output can come 3800 lumens. It can be a perfect guide when you ride bicycle at night.