*Adopts LED lamp as light source, low energy consumption, long service life, small and light, safe concealed terminal, good reliability, durable to use. *High brightness LED chip and loud speaker design, can shine brightly and generate sound loudly at the same time to makes it easier for you to recognize real-time working conditions at night. *Can be used as indicating signal, forecast signal, accident signal and other indicating signals in various electrical circuits. *Applied to electric power, telecommunications, machine tool, ships, textile, printing, mining machinery and other equipment.