1Work online 24 hours a day and all year round, check every 5 seconds to accurately grasp the trend of CO changes. 2WiFi networking, remote monitoring, and detection data can be viewed through mobile phones anywhere. 32 different networking methods, namely WiFi networking and mobile phone hotspots to simulate WiFi networks to allow devices to go online. 4Use the mobile phone APP settings to automatically turn on or turn off the display content. 5Carbon dioxide solid electrolyte chemical sensor is reliable and accurate, with stable performance. 6Device sharing, you can share with up to 4 people. A 90day historical record of cloud storage technology. Item Type: Air Quality DetectorMaterial: ABSWeight: Approx. 149g / 5.3ozVoltage: 5VCurrent: 1AAudible Alarm: BuzzerCarbon Dioxide Sensor: solid electrolyte chemical sensorCarbon Dioxide Detection Range: 400-3000ppmCarbon Dioxide Accuracy: 80ppm+6%Working Temperature: 0-50Working Humidity: 30-80%Network: WiFi (2.4G frequency band)Power Supply Mode: USB power supply or 2 x AAA batteries (battery not included)Product Size: Approx. 5.9x5.9x2.5cm / 2.3x2.3x1.0in 1 x Air Quality Detector (Battery Not Included)1 x Manual1 x USB Cable When the battery is installed, the USB power supply mode cannot be used.