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Intelligent Sensing Brake Light:The ACRUNU bike tail light features an intelligent sensing brake light, ensuring safety during night cycling on roads and mountains. USB Rechargeable Warning Light:This tail light is USB rechargeable, offering and convenience flexibility in usage and charging, making it perfect for long rides. Long Battery Life:With a battery life of 13~42 hours, this tail light ensures long-lasting illumination, enhancing visibility and safety during night rides. Smart Design for Cycling:The smart The design of this tail light makes it an essential accessory for cycling, enhancing safety and visibility on the road or mountain. Versatile Usage:Whether you're cycling on the road or off-road, this tail light is designed to provide optimal illumination in various riding conditions.