Temperature and humidity technical indicators. When 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) that outputs DC 5V at Greater than =1000mA.Fully charge for at least 2-3 hours before use. Avoid charging with a USB computer port which only outputs 500mA.Display :3.5 inch LCD displayAtmospheric pressure: 86Kpa - 106KpaDetection for O3: ElectrochemistrySampling time: 1.5 secondsProduct Size: 130*80*30MMDetection temperature: -10C to 50C;Relative humidity: 20% - 85%Storage temperature: -10C to 60C;Concentration unit for O3:ppm source: Lithium battery with 2000mAh capacity;5V DC charging via -USB portProduct weight: 160gThis product is an quality monitor that detects Ozone,Temperature, and Humidity. it combines sensors real-timemonitoring of Ozone(O3),temperature, and humidity onits display.Features-3.5 inch LCD display-Test variables Ozone(O3),temperature, humidity- 2000mAh capacity Lithium battery-5V -USB charging-Low battery warningO3 technical indicatorsMeasuring range: 0-5PPMSensor for O3: ElectrochemistryResolution: 0.001ppmMeasuring range: -10-50 CMeasurement accuracy: 1 CHumidity range: 20%-85% RHMeasurement accuracy: 4% RHMaterial: plasticcolour: WhitePackage Contents:1 x Quality monitorOnly the above package content, other products are not included.Note: Light reflection 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.