Check the listing for details. System Sensor CO1224TR - Same Day Shipping (SEALED). Condition: New. Listed at 69.00 USD. System Sensor CO1224TR | Round, 12/24 volt, 6-wire, system-monitored carbon monoxide detector with RealTest (R) Technology, ideal for ceiling installation | Same Day Shipping (SEALED BOX) The System Sensor CO1224T, CO1224TR, and CO1224A (Canada) Carbon Monoxide (CO) Detectors use a highly accurate and reliable electrochemical sensing cell to provide early warning of dangerous CO levels. Features• A 10-year end-of-life timer• RealTest® enables a functional test using canned CO• A code-required trouble relay• Wiring supervision with SEMS terminals • 12/24 VDC• A low current draw of 20 mA in standby and 40 mA in alarm• Versatile mounting for wall and ceiling• Accurate and reliable electrochemical sensing technology• Optional CO-PLATE CO Detector Replacement Plate to upgrade previously installed competitor detectors to the CO1224T or CO1224A.• CO1224T tested up to 12,000 feet above sea level