This small block controller can enhance your brake light function with 4 times fast-blinking and 4 times slow-blinking and then turn stable solid light. Improve traffic safety warning, to avoid rear-end accident. Working Voltage: 9-30V, will suitable for all motor vehicles, cars motorcycle tank armored vehicles electric bicycle and other LED Lighting Accessories Bulbs. Complete sealed technology make it waterproof, short circuit prection. Easy to install. There are input and output, Black wire for Negative Pole, Red wire for Positive Pole. High quality and strictly controlled system for durable and highly performed use. Buy with confidence, any other problem please feel free to contact us, we are always here to satisfy of you.