Main Feature: Electronic Bell+ Bright LED Strobe Electronic fire sirens are intended for fire alarm applications only Polycarbonate / ABS housing Designed to deliver maximum loud and clear fire siren sound generated by the electronic circuit inside. Will produce the sound similar to a motorized fire siren, which normally shall be distinguishable from normal ambient sound These fire sirens can be fixed on standard utility box Technical Specification: Voltage: 24VDC (50mA) Voltage: 12VDC (100mA) Sound: 100dB +/- 5dB (at 24VDC, 1 meter) Strobe: 8, 000mcd, six super bright LEDs Tone: Harmonic bell sound or Sweep tone or Siren sound Operating current (at 24VDC): 22mA (bell only); 50mA (with strobe) Material: Polycarbonate (UL94V-2), Color: Red