Chrome Finished Dual Tone Horns operate on a power supply rate of 12 V or 24 V. These Dual Tone Horns function at high tension frequency rate of 430+/-30 Hz and low tension frequency rate of 350+/-30 Hz. Dual Tone Horns are offered in heavy duty chrome finish. Chrome Finished Dual Tone Horns maintain a sound level of 120 dBA.