1Professional grade detection technology, this CO2 meter has stable performance, and high accuracy. 2Equipped with reset function, after reset all the parameters will be restored to factory parameters. 3Suitable for home, public site, agriculture, animal husbandry, industry, and more. 4It can be placed on desktop, light weight and in small size, easy to store and carry. 5Builtin polymer lithium battery, support USB charging, long standby time. Item Type: Carbon Dioxide Monitor Material: ABS Color: White Size: Approx. 13.2x9.5x5.2cm / 5.2x3.7x2.0in Weight: Approx.256g/9oz Detection Principle: NDIR Sampling Time: 4 seconds Effective Range: 400-5000 ppm Accuracy: 30ppm or 3% of reading Temperature Range: 7 ~ 50 Temperature Resolution: 1 Humidity Range: 0 ~ 99% Humidity Resolution: 1% Working Environment: 0~50, 98% Display: 2.5 inch TFT screen Resolution: 320x240 Voltage: 5V Current: 1A Battery: Polymer lithium battery 1500 mah Charging Time: 4-5 hours Standby Time: Continuous 6-12 hours } 1 x Carbon Dioxide Monitor 1 x USB Cable 1 x Instruction Manual 1. Please allow 1& 8209;2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.