Features: 3.5 inch LCD display Test variables Ozone(O3), temperature, humidity 2000mAh capacity Lithium battery 5V -USB charging Low battery warning Display : 3.5 inch LCD display Atmospheric pressure: 86Kpa - 106Kpa Detection for O3: Electrochemistry Sampling time: 1.5 seconds Detection temperature: -10C to 50C Relative humidity: 20% - 85% Storage temperature: -10C to 60C Concentration unit for O3: Power source: Lithium battery with 2000mAh capacity Material: Plastic colour: As shown Package Contents: 1 x Portable Ozone Analyzer Only 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.