The K-TA3W-433 is a wireless strobe/siren that works with all Standard K Series radio controls. The transmitter sends a signal to the receiving unit and strobe/siren simultaneously. The strobe/siren comes programmed with our standard programming which is strobe only for the Hoist(s) function, strobe and siren for the Trolley & Bridge function(s). The strobe flashes green indicating that the radio in energized and ready. The siren sounds anytime the Start button is pressed. The strobe/siren accepts a wide range of voltages including 24 to 264 Volt AC or DC. Custom programming is also available.