3in1 Portable Carbon Dioxide Detector with LCD Digital Temp Humidity CO2 Meter LED Lighting many buyers don't think our

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"0000" (four zeros) for the code or passkey

Connect the power adapter

3in1 Portable Carbon Dioxide Detector with LCD Digital Temp Humidity CO2 Meter LED Lighting many buyers don't think our3in1 Portable Carbon Dioxide Detector with LCD Digital Temp Humidity CO2 Meter Features: Large LCD screen, different font colors display different air quality, green numbers, yellow numbers, orange numbers, red numbers, four colors above 2000ppm flash at the same time. The product has a compact structure and is easy to transport. The ventilation holes on the back not only accelerate the convection between the air and the machine, so as to obtain