Two-layer, dry contact warning horns have robust bodies crafted with ABS and a polycarbonate lens, and provide multicolor alerts available in red and yellow, as well as steady-flashing, strobe and rotary modes. Thy also feature on/off response time of just 10 ms; dual-tone alarm of 120 dB at a distance of 1 m; all-weather temperature range of -20 °C to 50 °C; guaranteed service life of 50,000 hours; resistance to water, dust, heat and UV rays; and ISO-9001, CE, RoSH2 and EAC certifications.