This is a self-locking push button switch. The device starts to work when the switch button is pressed, and stops when the switch button is pressed again. This switch comes with pre-wired sockets and requires no soldering, making your job easy! The LED light can be on all the time or only when the device is working, depending on how you connect the wires. The metal button head is made of industrial-strength stainless steel, with a bright appearance, not easy to rust, waterproof and dustproof, strong and durable. This push button switch is the best choice for doorbells, car and motorcycle improvements, boat horns, auto-start switches and other applications that require a temporary activation current.