Multiple 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 taillights have 6 lighting modes: constant high brightness, constant medium brightness, constant low brightness, light flicker, medium flicker, strobe, click the button to switch. [USB fast charging] The headlights have a built-in 800MAH lithium battery and the taillights have a built-in 540MAH lithium battery. They only take an hour to fully charge. There is a hidden USB charging port on the side of the device, which can be connected to a computer and other devices with a USB port for fast charging, avoiding unnecessary battery replacement. Lightweight/Sturdy/Waterproof: The bike light set uses PC plastic housing, so you don't have to worry about it being too heavy, it is suitable for men and women. The USB interface is covered with waterproof and dustproof silicone, combined with advanced IPX5 waterproof and dustproof technology, suitable for various weather conditions. Easy to Install and Remove:It is installed with a high-elastic silicone mounting strap , which is very soft and easy to stretch, and can be easily loosened and fixed without tools. , suitable as a road bike light, MTB bike light, perfect for children and all cyclists. Package content: 2 bicycle lights, 2 data cables, 2 fixed cables.