Features:* Output bright can come to Max 4000 Lm [Lumens]* Waterproof design， but dont put it into water directly* Extensive Lifetime of Cree LED (100，000 hours)* Aluminum alloy structure with wear-resistant anodized finish， deep heat sink finish.* Internal wiring applies the high efficient booster circuit， working voltage is wide and can utilize the batteries in the largest extent. Specifications:* Body Color: Black* Body Material: Aluminum alloy casing* Switch Mode: On/off* Lumens : 4000 Lumens (Rated by manufacturer )* 3 switch Mode: High/Low/Strobe (press 3 seconds)* Battery Charger: US / EU plug optional* Working Voltage 8.4 V* Power Supply: 4 x 18650 battery (4400mAh)* Current 1-2.5 A* Runtime (Hr.): 4hrs* Feature: Aluminum alloy reflector， Rechargeable， Waterproof * Dimension: 5.5*4.4*4.0cm (L*D*D)* Weight: 0.490kg Package List:1 * 3Cree LED Bicycle Light2 * Rubber ring for installation1 * 8.4V 4400mAh rechargeable battery pack1 * 1A Charger (US / EU plug for your choice)1 * Box