The twilight switch WZM-01/SOS is used to control lighting devices or other energy receivers depending on the lighting intensity. The system turns the lights on at dusk and off at dawn. The activation threshold can be smoothly set by the user. The system is resistant to short-term changes in light intensity, which guarantees operational reliability. The external light intensity probe SOS-01 (included) transmits the signal to the twilight switch WZM-01. The probe connection cable with a maximum length of 50 m allows it to be placed in convenient places