1Common negative red yellow green lamp are separately controlled. 2Ultra-fast response， strong anti-interference ability and high cost performance. 3Ultra low energy consumption， long transmission distance. 4Each set including 10pcs of light module to meet quantity needs. 5Powered by 5V power source which is easy-to-get.Item Type:Traffic Light ModuleSize:56 x 21 x 11mm / 2.2 x 0.83 x 0.43inColor:Red Yellow GreenLED:8mm x 3Brightness:Normal(Red>Yellow>Green)Voltage:5VInputDigital Signal OutputInterface:Common Negative10 x Light ModuleFrequency asked questions:1>. Does it work with 3.3V or 5V?Q : It can work with 3.3V and 5V.2>. Is it RGB?Q : No，Each LED lamp can only emit one color of light.3>. Can 3 LEDs be illuminated at the same time?Q : Yes，it can.It can be controlled by yourself.