Common Display screenTest variables: carbon dioxide (CO2), temperature, humidityLarge 2200mAh capacity Lithium battery5V -USB chargingLow battery warningSpecifications:Display Method: Common Display ScreenPressure: 86Kpa - 106KpaSampling time: 1.5 secondsStorage temperature: -10 c to 60 c;CO2 Concentration Unit: PPMPower source: Lithium battery with a capacity of 2000mAh;DC 5V power supply via -USB portInstructions:1. StartWhen you long press the power button, the air quality monitor will start.2.About ChargeWhen the low battery icon is displayed, the device needs to be charged. Insert the included or another compatible -USB charging cable into the device. Attach the other end to a USB DC charger (such as a smart phone charger) which outputs DC 5V at more than = 1000mA. Charge fully for at least 2-3 hours before use. Avoid charging with a USB computer port which only outputs 500mA.3. ParametersCarbon Dioxide Monitor IndicatorsMeasuring range: 400-5000PPMResolution: 1 PPMMeasuring range: -10-50 cTechnical temperature and humidity indicatorsHumidity range: 20% -85% RHMeasurement accuracy: +/- 1 cMeasurement accuracy: +/- 4% rhCO2 sensor: infrared (NDIR)Colour: blackMaterial: ABSPackage Contents:1 * Air Quality Monitor1 * English manualOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.