[Diversified 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 fast charging] 800MAH lithium battery is built in the front light and 540MAH lithium battery is integrated in 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/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 . 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 for all kinds of bicycles, very suitable for children and all cyclists. Travelling by bicycle: Bicycle headlamp illuminates the road and guides the direction, and the taillight always reminds pedestrians and vehicles behind. Accompany you on your journey. Helmet Light: As a helmet light, it can make it easier for your partner or others to find you. Children's car lights: Install taillights on children's vehicles to remind others to avoid them and better protect them. Pet light: It's also a good choice to bring the bike tail light to your dog or other beloved pet. Product size: 4.3*2.7cm, 4.3*3cm. Shipping quantity: 2 pieces.