VARIOUS LIGHTING MODES:The white headlights have 4 lighting modes: constant high brightness, constant medium brightness, constant low brightness and strobe (activated by double clicking the button); the red rear lights have 6 lighting modes: Constant high brightness, constant medium brightness, constant low brightness, slight flicker, medium flicker, strobe, click the button to switch. USB QUICK CHARGE: 350MAH lithium battery is built in the front light and the 250MAH lithium battery is integrated in the taillight. They only need an hour to fully charge. There is a hidden USB charging port on the side of the device, which can be connected to computer and other devices with USB port for fast charging, avoiding unnecessary battery replacement. LIGHTWEIGHT/STURDY/WATERPROOF:Bike Light set use the PC plastic case, so you don't have to worry about it being too heavy, it is suitable for both men and women. 'Women's. The USB interface is covered with waterproof and dustproof silica gel, combined with advanced IPX5 waterproof and dustproof technology, suitable for various weather conditions. EASY TO INSTALL AND REMOVE: It is Installed by high-elastic silicone mounting strap, which is very soft, easy to stretch, and can be easily loosened and fixed without tools. The light can be firmly fixed on the frame and the backrest, Suitable as a road bike light, mountain bike light, very suitable for children and all cyclists. Package content: Rear bicycle lights *2 Warm advice: Dear buyer, due to lighting effect, monitor's brightness, manual measurement etc, there may be some slight differences in the color and size between the photo and the actual product. Sincerely hope you can understand! Thank you!