20-in-1 Multifunctional Air Quality Detector: Monitors CO2, CO, TVOC, HCHO, PM2.5 or PM1.0 or PM10 levels, temperature, and humidity with time or date display. Doubles as an alarm clock. App Connectivity: Sync with a smart app for real-time monitoring, remote data access, and historical records. Auto-updates time or date via phone. Clear Display and Alerts: 2.8-inch color screen with adjustable units (Celsius or Fahrenheit) and customizable views. Alarms notify abnormal readings. Versatile Use: Durable plastic build, portable design. Ideal for homes, offices, schools, warehouses, and agriculture. Specs: - Display: 2.8" TFT - CO2 Range: 400�C6000ppm (��1ppm) - CO Range: 0�C500ppm (��1ppm) - TVOC: 0�C2.0mg or m3 | HCHO: 0�C0.6mg or m3 - PM2.5 or PM1.0 or PM10: 0�C1000��g or m3 (��1��g or m3) - Temp: -20�C55��C (��1��C) | Humidity: 0�C99 percent RH (��3 percent ) - Power: 3.7V 2000mAh (main unit), 2x AAA (slave units, not included) Package: 1x Main Monitor and 5x Slave Units Note: Slight color or measurement variances may occur due to display or batch differences.