Specifically designed for use in an alarm system. Units are designed to the same standards as CO sensing systems used to protect workers in industrial plants and hospitals. UL 2075 listing meets all the sensitivity testing requirements of UL 2034 and is approved for system use. Features and Benefits Low 8mA current draw eliminates need for additional power supplies End of Sensor Life indicator warns when alarm replacement is needed TEST/HUSH button makes testing and silencing the alarm simple 85dB temporal-4 sounder provides distinctive alarm notification Listed UL 2075 for commercial or residential applications Exclusive industrial-grade electrochemical technology increases reliability First CO detector manufactured by an industry leader