SoundOff Signal (ETSA200R) 200 Series Compact Siren with Remote Amplifier and Remote Switch Panel Class D technology with high speed digital switching provides higher efficiency, less current draw and better reliability Operate a single 100 watt speaker or dual 58 watt speakers, Built-in protection against over/under voltage, over temperature, short circuit and reverse polarity Hermetically sealed, providing protection in wet areas; Park/kill feature disables the siren when the vehicle is place in park 5 popular warning tones: wail, yelp, piercer, hi-lo and super hi-lo 10-16 Vdc, SAE J1849 certified, CA Title 13, Article 22 compliant