Magicshine U2 Version LED Bike Light, 2200-Lumen, Black Light source: 2 x CREE XM-L U2 LED Luminous flux: 2200LM Shell material: 6061-T6 Aluminum alloy Battery: 418650 Li-ion battery (8.4V6.6AH) Surface treatment: Premium Type III hard-anodized anti-abrasive finish