... lithium battery.3. No circuit. Just stick .4. The brightness of LED is near car taillights. 2 x Blue2 x White2 x Red ... spray. Same as car paint. Corrosion resistant,anti-aging.6. Automatic turn on. Built-in high sensative vaberate sensors, and light sensor system ... . 14-foot chip,dual-loop control, with delay shut down system, in the process of parking or red light, continue blink; 120 ...