The W2H is solid-state, compact, rugged but lightweight; the system is programmable, which allows the convenience of tone selection, without the need for separate tone modules; each unit can be programmed for any one of four different tones (whoop, wail, hi-lo and horn), by wiring to the corresponding terminal on the unit’s terminal strip; separate sound modules not required. Unit may be field wired for multiple signal selection by manual or automatic control 180° speaker rotation allows flexibility in direction of sound.