Kidde Battery Operated Alarm, 2-pack

Key Features:

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• Digital Display – Shows CO level in PPM (parts per million). Updates digital reading every 15 seconds allowing you to see if levels change.
• Peak Level Memory – Displays the highest CO concentration measured since the last reset.
• Self Activation – Alarm automatically activates when attached to the mounting bracket.
• Box includes two 10-year battery operated digital display 
• Test/Reset -Tests CO alarm circuit operation and allows you to immediately silence the alarm.