Model Number: CJB300B Brand Name: Senken Key Specifications/Special Features: Micro-chip design and high efficiency transformerSignificant and anti-jamming audible warning signalsSeparate controller for easy operationWorking voltages: DC 12V or DC 24VWorking current (per speaker output): 11.5 +/- 1A @ DC 12V, or 6 +/- 1A @DC 24VIdle current: equal to or less than 1A @ DC 12V, or less than 500mA @DC 24V Quiescent current: equal to or less than 350mA @DC 12V, or less than 200mA@DC 24VLoad impedance: 6 OhmsMatched speaker: 2 x 150WSiren tones: Wail-1, Wail-2, Hi-Lo, Yelp, Traffic, Tool, Air HornSiren light control: three ways