Features: -The Signal Lamp with special symbols can be carved inside of the lampshade. -High-strength polycarbonate lampshade material. -Built-in screw wire is more safe and convenient. -Pilot Indicator Light has long service life, lower power consumption and compact. -With concealed terminal, it is both safe and creditable. -Apply to Signal lines for directions signal, anticipating signal, fault signal and any other signal, which in electric force, telecommunications, machine tool, vessel, textile, printing, Mining machine, etc.