About this item 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 on the button) ; the red tail lights have 6 lighting modes: Constant high brightness, constant medium brightness, constant low brightness, light flicker, medium flicker, strobe, click the button to switch. USB QUICK CHARGE The 800MAH lithium battery is built into the front light, and the 540MAH lithium battery is built into the tail light. 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/WATERPROOFBike 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 a highly elastic silicone mounting strap, which is very soft, easy to stretch, and can be easily loosened and fastened 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.