1. Built-in 24GHz millimeter wave radar, detection range up to 60m for cars and 30m for motorcycles, 54-degrees wide angle coverage to detect vehicles around bends and blind spots. 2. Audible and visual dual alerts, sound reminder can be turned on/off. Brake sensing function automatically brightens the light when braking. 3. Intelligent filter for group riding to reduce false alarms from riders at same speed, equipped with vibration wake-up function. 4. 40 high brightness COB LEDs, visible up to 500 meters at night. 5 lighting modes: steady, fast flash, slow flash, breathing flash, warning flash. 5. IP64 water resistance for rainy rides. 1000mAh rechargeable battery with Type-C charging. Two brackets for seatpost and saddle rail mounting. 6. Ultra lightweight 54g compact body, easy to install and compatible with road bikes and mountain bikes.