1800 Lumens Ultrafire Wf502b Cree T6 Xm-l LED Flashlight CREE XML T6 with 1800 Lumen output with Integrated Belt Clip 5 Modes: High, Low and Strobe, SOS Aluminum alloy casing with o-rings for water resistant design.as compared to 502B it has a belt clip Can be mounted on tactical rail with 1" ring mount Rugged, anodized, CREE LED designed to last 100,000 hours