Description Display method: LED Screen display Atmospheric pressure: 86Kpa - 106Kpa Sampling time: 1.5 seconds Product Size:270*90*35mm Detection temperature: -10°C to 50°C; Relative humidity: 20% - 85% Storage temperature: -10°C to 60°C; Power source: Lithium battery with 2000 mAh capacity; 5V DC power charging Product weight: 350g This product is a decibel meter that detects& 65292; Noise,Temperature, and Humidity. it combines sensors real-time monitoring of decibel& 65292;temperature, and Please read the instructions carefully before using this device. Please keep the manual handy for quick reference and troubleshooting. Avoid covering the air intake areas during use to avoid inaccurate measurements. Avoid use of solvents to clean the product as residual fumes will skew air quality readings. Avoid water or other liquids near the product to avoid electrical damage. Do not allow unauthorized modification or repair of this product. Features: -Large screen LED display -Support real-time testing of the concentration of decibel -Large 2000mAh capacity Lithium battery - -Adjustable LED brightness Noise indicator 30dB~65dB Green 65dB~85dB Yellow 85dB~130dB Red Key operation Power button, Press to turn on/off Adjust the brightness-make it brighter Adjust the brightness-make it darker DC adapter input port LED display Installation Notes The positioning sticker is attached to the position to be installed. 2)Punch a 6mm hole at the 2 marked positions of the positioning sticker and drive the rubber plug into the wall. 3)Drive in the screws, and pay attention to about 4mm exposed. Then hang the CO2 meter up. 4& 65289;Connect one end of the USB cable to the USB power adapter, and the other end & 65288;round connector& 65289;to the power input port on the side of the device(input voltage & 65306;DC5V) Working method Under normal working conditions, don't do any settings, just plug USB port to the power adapter and the DC round head into the device. You can test the current CO2 value and temperature and humidity in real time. Automatic calibration During the first use, please Turn on device and keep more than 24 hours, the device will automatically calibrate.