Features: 1.Intelligent Braking Sensitive Sensing Light Warning When the light senses the brake during riding, it will light up for 2 seconds to warn the vehicle behind, making it safer to ride. 2. 5 Light Modes, Applicable to a Variety of Scenes Single-click the function key to switch five modes single flash/double flash/breathing flash/running flash/long flash. Double-click to switch intelligent/manual mode, intelligent mode vibration sensing, automatic wake-up, 2 minutes of sleep, sensing the vibration automatically wake up (green indicator light for intelligent mode) 3. Vertical Installation Design for Broken Air Ducts Vertical wind breaker design reduces the resistance when riding and improves the riding speed. 4.Intelligent Light Sensing, Start and Stop can Save Electricity Intelligent mode will automatically detect the ambient light, when entering the tunneland changing to darkness, it will automatically light up. It will automatically hibernate when it sits aside for two minutes during the daytime. 5. IPX6 Waterproof Fearless of the impact of bad weather on the lights (not long time soak in water) 6. Type-C Charging, 5000mAh Capacity Four sets of power indicator lights (two for each group), fully charged four sets of lights always on 7. Compact and Portable, Easy to Organize 8. Seatpost Bracket and Saddle Bracket