... t6,IP65 waterproof 4x18650 battery 4work modes CE,ROHS,UL bike lights Operation Modes: The initial short press of the button ... switches the light from one mode to the next, i.e. High, Medium, Low, Flash. In each of the modes, rotating ... )8800Head Diameter (mm)47Length(mm)42Battery4PCS 18650WaterproofIP65 Pictures High quality bike lights li-ion battery(CE,Rohs,ISO,UL-STR)