MagicShine 2013 Model MJ-808U Bicycle Light with Improved Battery Pack, 1100-Lumen, Black Light source: CREE XM-L U2 Luminous flux: 1100LM Shell material: 6061-T6 Aluminum alloy Battery: 418650 Li-ion battery (8.4V4.4AH) Surface treatment: Premium Type III hard-anodized anti-abrasive finish