【MINI 5-IN-1 AIR QUALITY MONITOR】The MINI 5-in-1 Air Quality Monitor can accurately detect HCHO, TVOC, CO2, temperature and humidity in the current air. Let you understand the air quality more clearly and protect the health of you and your family. The mini lanyard design makes it so convenient to carry it or hang it anywhere. 【HIGH-PRECISION AIR QUALITY DETECTOR】The portable air quality detector is equipped with high-precision semiconductor sensors, which have higher sensitivity and faster response. Measurable HCHO concentration range 0~9.999mg/m³ (±0.001mg/m³), TVOC concentration range 0~9.999mg/m³ (±0.001mg/m³), CO₂ concentration range 400~5000PPM, temperature range -10~50° C (±1°C) / 14~122°F (±2°F), humidity range 0~95%RH (±2%RH). Data is refreshed every 2 seconds. 【4-SEGMENT HCHO AIR QUALITY INDICATION & SOUND ALARM】According to the HCHO concentration data, the MINI air quality monitor can present 4-segment color indication. 0.100mg/m³ (yellow/caution), >0.500mg/m³ (orange/warning), >0.600mg/m³ (red/dangerous). The default HCHO concentration exceeds 0.100mg/m³ to start the "BiBiBi" cycle alarm, once every 10 minutes. Short press the "S" key to switch the buzzer on/off. 【BUILT-IN BATTERY & BACKLIGHT DISPLAY】The MINI 5-in-1 air quality monitor has a built-in 1000mAh lithium battery, which can last about 40 hours on standby when fully charged. The 1.9" ultra-high-definition color backlit screen allows you to read easily even at night. The backlight function has 3 brightness levels, short press the "M" key to adjust the screen brightness mode (low, medium, high). 【WIDE RANGE OF USES】This portable MINI 5-in-one air quality monitor is simple in design, beautiful in appearance, small in size, light in weight, easy to carry, easy to operate, etc. Portable lanyard design can be widely used in outdoor and indoor activities, home, office, school, camping, picnic, boat, airplane, outdoor adventure, car and garage and other places.