Camden Door Controls Cx-DESPK Speaker station is designed for industrial and commercial applications, where both audio and visual indication is required. The RGB LED is capable of visually displaying three distinct colors for designated states- red, green, and yellow. The 8 ohms speaker can provide audio messages remotely. The faceplate is Stainless Steel with a 1.37" Square Lens. This unit requires 12/24V AC/DC to operate.