[5-in-1 Functionality] This versatile air quality monitor supports your health by tracking multiple key parameters, ideal for use in homes, offices, classrooms, hotels, gyms, greenhouses, warehouses, and more [LCD Color Screen] Displays CO? levels, CO? index, HCHO (formaldehyde), TVOC, temperature, humidity, and battery life. The LCD color digital screen provides clear readings, even in dark settings [CO? Monitor] Equipped with a semiconductor sensor and airflow detection for quick, accurate measurement of CO? concentrations in your environment [4-Color Indicator with Alarm] CO? levels are visually indicated: green (0-799 PPM), yellow (800-1199 PPM), orange (1200-1599 PPM), and red (1600+ PPM). An alarm sounds if CO? levels exceed 1500 PPM, alerting you to poor air quality [Rechargeable Design] Built-in 1200mAh rechargeable lithium battery with long-lasting power. The device charges quickly through a USB Type-C port, compatible with adapters, power banks, and laptops Specifications: Voltage: 5V DC CO? Detection Range: 400-5000 PPM HCHO Detection Range: 0-0.6 mg/m³ Temperature Measurement Range: 0-50℃ Humidity Measurement Range: 0-99% RH Charging Port: Type-C, 500mA Screen: LCD color display Detection Principle: NDIR CO? Detection Sensitivity: 1 PPM TVOC Detection Range: 0-2.0 mg/m³ Temperature Accuracy: ±1℃ Humidity Accuracy: ±2% RH Battery: 3.7V 1200mAh lithium battery