INCREDIBLY VERSATILE COMMUTER LIGHTThe central 300 provide loads of light at a great value & also has more mounting options than one can imagine. Spec;300 max lumens FL-1 Standard IP-65 Waterproof Modes & Runtimes: High: 300lms @ 2hrs Medium: 150lms @ 4hrs Low: 80 @ 8hrs Strobe: 80lms @ 20hrs Pulse: 80lms @ 15hrs Power: Push ONPush button to cycle modes Push & hold 1sec OFF160 grams Micro-USB &8804;6hrs recharge Meets ANSI FL-1 Standard This standard was created by the American National Standards Institute &40;ANSI&41; to provide consistent performance measurements for handheld lights. Although bicycle lights are not required to follow this or any standard Blackburn believes in offering full transparency in how the output run time water resistance & other performance claims are measured. LED Fuel Gauge/ Charge Indicator A small built in LED light indicates the battery level. Green = >75% Orange = 75-25% Red = Dual Beam Pattern Dual beam pattern allows crystal clear near & far visibility. Replaceable Battery Battery pack can be replaced in seconds. Universal Light Mount The silicone mount fits diameters from 22-35mm along with a clip for clothing bags or racks. Micro-USB Rechargeable Charges via any standard USB (Universal Serial Bus) port.