The GEARLIGHT 4-Pack LED Safety Lights are compact and portable tail lights designed for bicycles. These red lights are powered by batteries and come with three settings. They have an IPX6 water resistance rating, making them suitable for use in various weather conditions. The lights feature easy-to-use operation, long-lasting performance, and are detachable for immediate use. They also include extra batteries for added convenience. Perfect for enhancing visibility and safety while cycling at night, these Gearlight LED safety lights are a reliable accessory for any biking enthusiast.