USB Type C rechargeable bike light, built-in 150mAh rechargeable lithium battery for each light. The headlight and taillight have a one-touch switch with three different lighting modes depending on your preference. Includes full brightness, half brightness, strobe. The silicone mounting straps are designed with two openings that fit snugly around many sizes of seat posts, handlebars, seat risers, backpacks, helmets, and stretch to keep the lights secure and steady. They can be easily removed and installed, and no tools are required. This bike light set is versatile enough for cycling, hiking, camping, or any outdoor activity, and can be used as an emergency flashlight. This is great for cycling at night or in places where visibility and safety are a concern. So, just start your next adventure with us. IPX5 waterproof, effectively resists heavy rain or strong water splashes. Small size, easy to carry, the back clip is easy to hang on the backpack and cycling clothes.