3-in-1 multifunction air quality monitor can detect CO2, temperature and humidity in your living environment. Adopting sensitive sensor, it provides quick and accurate data in the large digital color screen. Powered by rechargeable lithium battery, it can be widely in home, office, classroom, hotel, car, cellar, greenhouse, warehouse and more Features: 3 in 1 Function: CO2 / temperature/ humidity tester. Multifunction carbon dioxide monitor cares for your health and can be widely used in home, office, market, classroom, hotel, car, cellar, greenhouse, warehouse, lab, etc. 3.5-inch Digital Screen: Displays CO2, air quality level (by 3-color expressions), temperature, humidity and battery level. Large digital color screen for easy and clear reading even in dark environments. Carbon Dioxide Tester: Adopts NDIR sensor and air convection detection, quickly and accurately detects CO2 concentration, ambient temperature and humidity in the living environment. Air Quality Level Indication: Excellent, 400-800PPM (Green); Good, 800-1800PPM (Yellow); Poor, 1800-5000PPM (Red). Clear at a glance, old people and children can easily recognize too. Rechargeable Battery: Built-in 1200mAh lithium battery, strong endurance and easy recharging. Simple but stylish appearance, place it on the desktop or wall mounted installation, fits in well with different house styles. Note: 1. Please read the user manual carefully before use. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: White Material: ABS + Electronic Components Screen: 3.5-inch Digital Color Screen Sensor: NDIR Sensor CO2 Detection Range: 400-5000PPM Accuracy: ±70PPM ± 3% Reading Temperature Measurement Range: -10~50& 8451; Accuracy: ±0.1& 8451; Humidity Measurement Range: 0-99.9% RH Accuracy: ±3%RH Response Time: about 10s Repeatability: ±0.5% Power Supply: 5V 1A Max. Power Consumption: 500mA Built-in Battery: 3.7V 1200mAh Lithium Battery Work Condition: 0-50& 8451;, 0-90%RH (Non-condensing) Storage Temperature: 16-30& 8451; Item Size: 98 * 66 * 30mm / 3.86 * 2.60 * 1.18in Item Weight: 138g / 4.87oz Package Size: 12 * 5 * 8cm / 4.72 * 1.97 * 3.15in Package Weight: 220g / 7.76oz Package List: 1 * CO2 Tester 1 * USB Cable 1 * User Manual (English)