The Dwn 50 is a USB rechargeable light with a light output of 50 lux. The light is clamped with a rubber band, so it fits all bikes with different handlebar diameters.the Dwn is a small but very powerful front light with a matte design. It can be recharged using the supplied USB C cable. The Dwn 50 has 3 lighting modes: mode 1 with 10 lux ensures maximum battery life. Mode 2 with 30 lux, nice intermediate mode. Mode 3 with 50 lux provides optimum light output. The battery offers up to 11 hours of cycling pleasure. When the battery is almost empty, the battery indicator will light up. When the battery is 21-50% charged, the light will turn green. When it drops below 20%, it turns red. When you charge the battery, it will be fully charged in less than 2 hours! LIGHT RANGE: 70 meters "to see", 4000 meters "to be seen". Safety description High-performance LED light with 50 lux intensity Meets German regulations (StVZO) 70 metres line of sight 4000 metres line of sight Comfort description Easy to operate switch Fastening strip diameter 22-35 mm Low battery warning indicator Technical description 3 light modes USB rechargeable battery Battery life: 11 hours Battery charging time: 2 hours Rechargeable with supplied USB C cable