High-Visibility Brake Light for SafetyThe brake light automatically brightens for 3 seconds when braking, enhancing visibility and ensuring safety during night rides.Multiple Lighting Modes (with Battery Life)5 modes: steady (5h), slow flash (10h), fast flash (8h), strobe (10h), and breathing flash (15h), providing optimal visibility for different riding conditions.Memory Function & Auto Sleep ModeRemembers the last light mode used, and automatically reactivates it upon power-up. Auto sleep mode activates after 40 seconds of inactivity, conserving battery.Durable and Compact DesignMade with aerospace-grade aluminum and high-strength transparent PC material, this tail light is durable, shock-resistant, and compact (49mm x 34mm x 34mm) for easy installation.Fast Charging & Long-Lasting Battery: Equipped with a 3.7V 500mAh polymer rechargeable battery, it supports USB charging (20cm cable) via a 5V adapter, computer, or power bank. The red charging light turns off when fully charged, ensuring youre ready to go.