Extremely splash-proof. Two-stage adjustable brightness to adapt to environmental conditions. Thanks to LED technology, battery life is up to 12 times longer. Up to 50,000 hours lifespan of the light source. Handlebar mount with quick attachment - use the included rubber strips for smaller handlebar diameters. Includes battery indicator. Operates with 2 x 1.5V AA batteries (not included). Approved for all bicycles in accordance with the German Road Traffic Licensing Regulations (StVZO). Burn time until the indicator lights up: at 40 Lux: approx. 2.5 hours, at 15 Lux: approx. 5.0 hours. Use cases: to see and be seen, for safe riding in the dark, optimal visibility for other road users, 15 Lux for well-lit streets, 40 Lux for poorly lit streets.