This Signal Tower Light is a great choice for industrial automation. It is 4 level with 4 colors (Red, Yellow, Green, Blue and Buzzer) and has a diameter of 60mm. It features PNP-NPN wiring output, a buzzer function, a red steady light, a 1.2m cable with 6 wires for electric connection, a black lampbody and a power supply of 24V DC. It is made up of ABS for the body, PC for the lens and base.