Description 1. Long press the switch for 3 seconds to turn on and off, short press to switch modes. 2. This product is designed for energy-saving and rational use by setting an automatic light sensing mode. The light does not turn on during the day or in a well lit space environment, but only turns on at night or in dim environments. It does not turn on during the day and turns on at night. 3. After about 20 seconds of startup, the light will turn off and vibrate to turn on. 4. Light mode: Flowing water flash Navigation flash Loop flash 5. Charging method: Under strong light, the solar panel can automatically charge when facing upwards Specifications Material: PC+LED Size: 8.5*2.8*1.5cm Applicable: automobiles, motorcycles, bicycles, electric vehicles, trucks, off-road vehicles, outdoor activities, etc Installation method: adhesive backing/screw installation Power supply method: solar power supply Features: Warning function to prevent rear end collision, dustproof and waterproof Package includes: 1* warning light