Led bike headlight front bike light type of bulb led low battery indicator light duration high 1 h light output 400 lumen material aluminium weight 105 g usb charger dimensions 53 x 3 x 75 cm light duration medium 2 h light duration low 5 h light duration flashing 11 h visibility 1 000 m power supply rechargeable battery protection class ip 68 splashproof waterproof