1、[INTELLIGENT ALARM] When HCHO concentration ≥ 1mg/m³, TVOC concentration ≥ 0.6mg/m³, the prompt light turns red and the buzzer gives an alarm, it means that the current air quality is poor. 2、[EXCELLENT SENSOR] The air quality monitor adopts excellent sensor with high sensitivity and good stability, which is helpful to quickly and accurately detect harmful gases in your home. 3、[LCD DISPLAY] The detector uses a large LCD screen to display real time detection data, the HCHO measurement range is 0‑1.999mg/m³, TVOC measurement range is 0‑9.999mg/m³. 4、[POWER SUPPLY] The gas detector is powered by 2pcs AA battery (not included), allowing longer test time and standby time, which is convenient for you to use anytime and anywhere. 5、[PORTABLE DESIGN] The gas monitor is handheld design, comfortable to hold, suitable for indoor and outdoor places such as household, car, hotel, apartment, office, etc. Item Type: Air Quality Detector Battery: 2 x AA Battery (not included) Function: HCHO detection, TVOC detection, rapid calibration, hazard alarm Model: RC3001 Resolution: 0.001mg/m³ Detection Principle: Semiconductor gas sensor principle HCHO Range: 0-1.999mg/m³ TVOC Range: 0-9.999mg/m³ Endurance: 6H Size: Approx. 160 x 55 x 20mm / 6.3 x 2.2 x 0.8in 1 x Air Quality Detector