1.Temperature and humidity technical indicators. When low battery is displayed, the device needs to be charged.Insert the included or another compatible Micro-USB charging cable into the device. 2.Fully charge for at least 2-3 hours before use. Avoid charging with a USB computer port which only outputs 500mA. 3.3.5 inch LCD display,Atmospheric pressure: 86Kpa - 106Kpa,Detection method for O3: Electrochemistry,Sampling time: 1.5 seconds,Product Size: 130*80*30MM,Detection temperature: -10°C to 50°C;Relative humidity: 20% - 85%,Storage temperature: -10°C to 60°C;Concentration unit for O3:ppm 4.Power source: Lithium battery with 2000mAh capacity;5V DC power charging via Micro-USB port 5.This product is an air quality monitor that detects Ozone,Temperature, and Humidity. it combines sensors real-time,monitoring of Ozone(O3),temperature, and humidity onits display., Manufacturer: EDEDE