D2 Class audible signal can function as either a horn or siren by setting an internal, tamper proof switch. Low current, high performance, high decibel signal which may be coded or used as a continuous alarm.
Diode polarized, heavy-duty, high decibel, DC vibrating horn signals. They are intended for use in hazardous locations requiring electrical supervision of signaling circuit field wiring. For non-fire alarm applications, horns have a NEMA type 4X rating and may be used outdoors (recommended above temperatures of +25F).