HM100 is a low-frequency siren speaker kit, together with a 100W Siren, that will add a supplemental warning to a fire truck.

Powered by DC 9-15V. Low frequency range can be 182 to 400Hz and high frequency range can be 500 to 1600Hz. 

Please be advised that in order to activate the low-frequency tones of the HM100, the regular siren tone must be operating, as the tones outputted are based on the vehicle’s original siren system. The HM100 Amplifier comes equipped with two mounting brackets, which enable the unit to be mounted in a variety of positions.