A. Easy installation: The bicycle lights can be installed in a few seconds without tools or other devices. They can be mounted on bicycles, backpacks, helmets, or other parts to enhance safety. B. Silicone alloy: The lights are made of durable silicone alloy, which can withstand various weather conditions, road use, and minor impacts. They are also waterproof. C. Multiple lighting modes: Each light has three lighting modes - high - beam, low - beam, and strobe. This makes it easier to be seen in the early morning fog, at dusk, at night, and at dawn. D. Safety design: The ultra - bright LED lights are equipped with two lithium - ion batteries, and the visible distance can reach half a mile. This helps other cyclists, drivers, and pedestrians notice you in low - light or dark environments. E. Product materials: The outer shell is made of silicone, and the inner shell is made of ABS engineering plastic and a circuit board. F. Lamp beads: The LED lamp beads are stable, durable, and malleable. They have a multi - functional fixing method, are waterproof and splash - proof, and are easy to operate. G. Batteries: The lights use two AG - 10 batteries.