240 lumen output and with up to 20 hour run-times you have the perfect light for the serious commuter or entry level off-road cyclist High power Seoul LED handlebar mounted dual-head unit Huge 240 lumen light output (120 lumen light output per head unit), with tiny power consumption for great power to runtime ratio Engineered reflector for a great dual spot and wide beam light pattern Compact, light weight and water resistant headlight design 3 modes - high, low and flashing Advanced Sanyo Li-ion battery with run-times of up to 20 hours with both head units on low or 5 hours on high Li-ion batteries are lighter, more reliable and more compact than lead-acid or Ni-Cad alternatives Built in smart-charge and protection circuit, maximising battery life Low battery indicator provides warning to make sure you're not caught out in the dark Versatile stem or frame mounted battery Enhanced side visibility for on-road use UK mains fast charger included The Bike Radar review gave 4 out of 5 stars