600 Lumens High and medium and low and strobe and sos Light Settings Cree Xml-u@ LED Bulb With Life Span Up To 50000 Hours Aircraft-grade Aluminum Body With Type 1 Anodized Finish Waterproof (ipx6) Micro USB Charging Port Requires One 18650 Li-ion Battery Reverse-polarity Protection Designed To Prevent Power Overload If Battery Is Incorrectly Installed