The Dwn 30 is a USB rechargeable light with a light output of 30 lux. The light attaches with a rubber band that can be stretched to fit most bikes. The Dwn is a small but very powerful front light with a matte design. It can be recharged using the supplied USB C cable. It has 2 light modes: mode 1 ensures maximum battery life and mode 2 provides optimal 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: 50 meters "to see", 3000 meters "to be seen". Safety description High-performance LED light with 30 lux intensity Meets German regulations (StVZO) 50 metres line of sight 3000 metres line of sight Comfort description Easy to operate switch Fastening strap diameter 22-35 mm Low battery warning indicator Technical description 2 light modes Battery life: 11 hours Battery charging time: 2 hours Rechargeable with supplied USB C cable