FMX 40mm Panel Buzzer for 30mm knockout, 2-tones, 85dB(A), 12-24VAC/DC, UL Type (NEMA) 3R, IP65 Two tones controllable via independent electric contacts 85dB ensures beacon is heard even in noisy environments Installs into standard 30mm knockout Operating temp: -22 to 122°F (-30 to 50°C) UL Type (NEMA) 3R, IP65 UL746C (f1) UV Protection, UL94 V-2 Flammability Rating