time and battery level. Large digital color screen for easy and clear reading even in dark environments. Air Quality Tester -- Adopts sensitive semiconductor sensor and air convection detection, quickly and accurately detects CO2, formaldehyde and TVOC concentration, ambient temperature and humidity in the living environment. 3-Color LED Indicator, Alarm Buzzer -- Healthy, 400-800PPM (Green); Worse, 801-1800PPM (Yellow); Serious, 1801-5000PPM (Red), at the same time, the alarm will start and last for 10s. Clear at a glance, old people and children can easily recognize too. Rechargeable Battery -- Built-in 1200mAh lithium battery, b endurance and easy recharging. Simple but stylish appearance, just place it on the desktop, it 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 #43; Electronic Components Screen: 6.5-inch Digital LED Screen Sensor: Semiconductor Sensor CO2 Detection Range: 400-5000PPM Accuracy: (50PPM #43;5% Reading) HCHO Detection Range: 0.005-2mg/m TVOC Detection Range: 0.008-2mg/m Temperature Measurement Range: 1~70 Accuracy: 1 (0~65) Humidity Measurement Range: 0-99% RH Accuracy: 2%RH Response Time: #xff1c;2min Built-in Battery: 3.7V 1200mAh Lithium Battery Work Condition: 0-50, 20-90%RH (Non-condensing) Item Size: 160 * 41 * 90mm / 6.30 * 1.61 * 3.54in Item Weight: 235g / 8.29oz Package Size: 18.5 * 5 * 11.5cm / 7.28 * 1.97 * 4.53in Package Weight: 406g / 14.32oz Package List: 1 * Air Quality Tester 1 * USB Cable 1 * User Manual (English, Japanese, German, French, Spanish, Chinese)