The TSZ-4D optical-acoustic outdoor siren performs the signaling function in two ways: red optical signaling (by means of blinking LEDs) and acoustical signaling (by means of modulated high-volume sound signal). Construction enables high level of tamper protection (against opening and removing from mounting surface).

High-impact polycarbonate enclosure, featuring a very high mechanical strength and guarantees aesthetic appearance of siren even after many years of using.