Magicshine 2011 Version MJ-816E LED Bike Light with Improved MJ-828 LCD Battery Pack and Charger, 1800-Lumen, Black Light source: CREE XM-L +2CREE XP-G Luminous flux: 1800LM Shell material: 6061-T6 Aluminum alloy Battery: 418650 Li-ion battery (8.4V4.4AH) Surface treatment: Premium Type III hard-anodized anti-abrasive finish