The ELK-100 Siren Driver is a great choice for residential and commercial security installations. It draws less current than most siren drivers, and offers two volume levels (example: one indoor, the other outdoor) simultaneously. Our exclusive MilliMiser™ option allows further reduction of current draw for controls that have limited alarm or auxiliary output power. The ELK-100 has two inputs, Yelp & Steady. The Steady sound overrides the Yelp. The Yelp input has our unique ComboTrigger™ feature, especially designed for controls that have a single alarm output with a pulsing option for fire or burglary. When pulsed, this channel produces a distinctive third sound pattern. FEATURES: • Two Volume Levels Simultaneously • Draws Less Current Than Most Sirens • MilliMiser™ Lowers Current Draw • Economical - Drives Multiple Speakers • ComboTrigger™ For Single Outputs • Pre-Wired for easy Installation • Lifetime Limited Warranty SPECIFICATIONS: • Operating Voltage: 6 to 14 Volts DC • Current Draw: 1.2 Amps, (700 mA on MilliMiser™ setting), with one 8 ohm speaker • Sound Level: 120 db @ 1 meter, 14 vdc, with one 8 ohm speaker • Max. Speaker Loading: 4 Ohms • Size: 2.75" X 3.6" (70mm X 91mm)