Magicshine U2 Version MJ-816U LED Bicycle Light with 4.4Ah BAK Battery, 1900-Lumen, Black Light source: CREE XM-L U2 +2CREE XP-G Luminous flux: 1900LM Shell material: 6061-T6 Aluminum alloy Battery: 418650 Li-ion battery (8.4V4.4AH) Surface treatment: Premium Type III hard-anodized anti-abrasive finish