About this item 🔌 【Plug-in 3-in-1 CO Detector】Plugs directly into any outlet – monitors CO, temperature, and humidity simultaneously on a clear segmented display. Ideal for RV and travel. 🔋 【Emergency Battery Backup】Insert 2 AAA batteries (not included) to keep monitoring during power outages – standby lasts over 25 days. Sensors continue working when unplugged. 💡 【Built-in Emergency Light】When CO reaches critical levels during battery operation, the bottom LED lig
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