1、2.8-inch large screen simultaneously display the current CO2 concentration, temperature, humidity and battery indicator. 2、1s automatic refresh detection data, real-time monitoring, stable and reliable. 3、4pcs color light bar(green, yellow, orange, and red) indicate for the corresponding CO2 concentration. 4、One button control, short press to switch the temperature unit between ℃ and ℉, long press to ON/OFF the detector. 5、Built in with 1200mAh rechargeable lithium battery, no need to change battery, economical and environment-friendly. 6、Compact portable size with simple modern appearance, suitable for home, office, dormitory, warehouse, etc. Features: 2.8-inch large screen simultaneously display the current CO2 concentration, temperature, humidity and battery indicator. 1s automatic refresh detection data, real-time monitoring, stable and reliable. 4pcs color light bar(green, yellow, orange, and red) indicate for the corresponding CO2 concentration. One button control, short press to switch the temperature unit between ℃ and ℉, long press to ON/OFF the detector. Built in with 1200mAh rechargeable lithium battery, no need to change battery, economical and environment-friendly. Compact portable size with simple modern appearance, suitable for home, office, dormitory, warehouse, etc. Specifications: Color: Black / White (Optional) Material: ABS CO2 Detection Range: 400~5000PPM CO2 Detection Sensitivity: 1PPM Temperature Measurement Range: 0~50℃ Temperature Measurement Accuracy: ±1℃ Humidity Measurement Range: 0%-99%RH Humidity Measurement Accuracy: ±5%RH Anti-interference: 47.22% Respond Time: ≤60s Working Voltage: 3.7V Charging Mode: USB 500mA Type-C interface Battery: 1200mAh built-in lithium battery Item Size: 90 * 70 * 40mm / 3.54 * 2.76 * 1.57in Item Weight: 146g / 5.18oz Package Weight: 220g / 7.78oz Package Size: 11.5 * 11.5 * 4.5cm / 4.53 * 4.53 * 1.77in Packing List: 1 * Detector 1 * Charging Cable 1 * Detector 1 * Charging Cable