Noise measuring device SLT for fixed installation with relay output and control output. The noise warning system consists of a measuring microphone with a handle and a wall mount with 1.5 m cable, a noise transmitter, and a digital display. The primary application of this noise warning system is in the continuous measurement and monitoring of noise levels in factory halls, production areas, and at large events (discotheques, fairs, go-kart tracks). The digital display features a relay output for triggering alarm horns or flashing lights for visual or acoustic warnings, as well as a control output. The threshold for this alarm output can be programmed on the display. Additionally, the analog output signal can be used to control window flaps, or the signals from the transmitter can be stored, analyzed, and documented on a logger. The noise warning device is very easy to connect and can be operated using 240 V mains power. The digital display for the noise warning system is pre-configured to work with the noise transmitter and can be used immediately.