Federal Signal PA300 Fully Featured 100W Electronic Siren With Priority Tone 690002 SAE J1849 and Class A compliant. Operates on 12VDC with PA & Radio re-broadcast. Available tones Wail, Yelp, Priority, Manual, and Air Horn. Integrated circuits and surface mount technology for reliability and performance. User selectable switching for horn ring tap and press/hold, manual horn/siren.