This device contains one horn and one control box. Its advanced design with lightweight, compact and selectable tone provides continuous and economical operation. All the unique tones are produced by a digital micro-controller unit (MCU). The built-in automatic control circuit enables more than 10 kids of selectable tone to be produced with a tone setting dip-switch.
*This feature is particularly useful in some specific situations where there are distinctive tones required, such as areas with high decibel of noise.