Magicshine MJ-872 LED Cycling Bike Light with Improved MJ-828 LCD Battery Pack, 1600-Lumen, Black Light source: 4X CREE XP-G LED Luminous flux: 1600LM Shell material: 6061-T6 Aluminum alloy Battery: 418650 Li-ion battery (8.4V4.4AH) Surface treatment: Premium Type III hard-anodized anti-abrasive finish