Mini Quality Monition:It is small and easy to carry,can be carried around as a decoration, you can check quality anywhere anytime.CO2 Detector: -in high-performance co2 sensor,using more infrared optical principles to accurately and quickly detect carbon dioxide.If the carbon dioxide concentration exceeds 1000ppm, an alarm will be issued immediately.USB Rechargeable Battery: -in 700mAh capacity USB rechargeable battery.Application Areas: Home, office,agricultural planting, greenhouse vegetables, production warehouse, raw material processing, home interior, etc.CO2 concentration measurement range:400-5000ppmDisplay:LCD displayBattery capacity:700mAh lithium batteryCharging :USB Type-CColour:blackMaterial:ABSSize:85 x 50.6 x 17mmPackage Contents:1 x quality monitor1 x usb cableOnly 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.