CPG Signals Model ASHX PowerTone® Explosion-proof Amplified Speaker is designed for use in hazardous locations and produces a crisp clear high decibel tone. The tone may be generated by a voice or tone generating system by a compact, solid-state, plug-in card. The speaker cone and projector are of spun aluminum. The circuitry, speaker driver and tone card are contained in an explosion-proof housing. An internal gain control allows for volume adjustment. The amplified speaker is listed for indoor/outdoor use, NEMA 3 rated and is finished in red enamel. Model ASHX Amplified Speakers operate at 24 VDC and are polarized for connection to system supervised alarm notification circuits. Weatherproof and corrosion resistant surface mount speaker is required.