Startup instructions: Dim light (at night), car stops, no flashing. Conditions: bright light (daytime), vehicle driving, LED light does not flash. Dark light (at night or in tunnel), car driving – light activates only when dark and motion is detected (light + motion). Unit automatically turns off after 120 seconds of inactivity. 8 LED beads, four-color warning light. Anti-build antenna design, LED shark fin solar warning light. Multiple color options, painted finish, corrosion-resistant and aging-resistant. High-efficiency solar panel, no external power supply required. Specifications: Size: 15x6x7cm Material: Plastic Color: Black, White, Gray, Gold, Blue, Silver, Red Package Contents: 1 x Shark fin warning light Note: 1. This product cannot replace the original car antenna; it is an antenna-style model only. No radio function included. 2. For first use, press the red switch button at the bottom to confirm the light operates properly before installation.