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Loading... Please wait...Nighthawk Carbon Monoxide Detectors include digital read outs that updates every 2.5 minutes to see if levels change. Peak level memory, test/reset button, U.L. Listed, 85db alarm, no sensor replacement and never needs re-calibration. The Federal Consumer Product Safety Commision recommends that every home be equipped with at least one CO detector mounted near sleeping areas. According to the CPSC Chairperson, "CO detectors are as important to home safety as smoke detectors." 5 year limited warranty.