Firewolf(TM) 12/24VDC Carbon Monoxide Detector, designed for professional residential and commercial alarm systems. Napco model FW-CO1224, Firewolf(TM) 12/24VDC is the ideal and well-priced warning device, sounding a powerful 85db alarm while drawing low current of 60 ua microamps, standby or 25mA in alarm. UL listed to UL2075, the Firewolf Carbon Monoxide Alarm Device is tested to meet UL2034 CO response requirements. Smart microprocessor along with precise solid-state infrared sensor technology optimize Firewolf(TM) 12/24VDC's detection accuracy. Napco's patented technology simulates CO gas level response in the human blood stream and independent lab tests prove it provides superior false alarm immunity over electrochemical units (see Lawrence Berkeley National Laboratory #40566 report.)