12 V Operated Dual Tone Horns function at a high tension frequency of 500+/-30 Hz and low tension frequency of 350+/-30 Hz. These Dual Tone Horns maintain a sound level of 110 dBA. These Dual Tone Horns are available in a diameter range of 90mm. 12 V Operated Dual Tone Horns can be availed in black or red colours to suit individual requirement.