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[Product Features:] Human voice prompt. High reliable electrochemical sensor. Carbon monoxide concentration displaying (PPM). Ultra-long Standby time. Alarm Memory Function, If the unit ever alarmed, press the button, the red LED will flash once every 30 seconds and the peak alarm level will be indicated on the LCD. Low Battery Prompt, The LCD screen shows "LB", the voice prompt"Attention please,low battery warning". Auto Detect Sensor Failure. [Operation Instruction:] 1. Put on the 3*1.5V AAA battery, these will be a voice prompt as "Welcome to use our voice Carbon Monoxide Detector, please wait 2 minutes for preheating". 2. It will display 2 minutes counting when the detector is in starting-up. 3. Press the Test/RESET button, the LCD screen will show"0"ppm, the red light flash, the detector also sound continuous alarm at the same time. [What you will get:] 3x Carbon Monoxide Detector (Batteries NOT included) 3x Mounting Accessories 3x User's Manual4 volts





