Turn any speaker (4 ohm minimum) into an alerting device. It can be wired to produce a steady high-pitched tone, or an intermittent bell-like tone; both frequency and sweep time can be adjusted via onboard trim pots. Operates on 6-15 VDC. 4" x 3" x 1" D. Max current draw: 2.5A w/15VDC @4 ohms. Max output power 60W w/15VDC @4 ohms.