SMART SENSOR 5-in-1 Digital Air Quality Monitor with Temperature Humidity PM2.5 Air Quality Monitoring Tool Indoor Air Quality Environment Testing Detecting Instrument for Indoor Air Quality

Features:
Air quality assessment of PM2.5: BAD, FAIR, or GOOD.
Display real-time temperature, humidity, PM2.5.
Temperature unit is C/F switchable.
3 large LCD screen displays data clearly.
Audible and visual alarm: red light flash (＞75ug/m3), Di Di Di sound (＞150ug/m3).
Battery indicator.
Functions of monitoring PM2.5, TVOC, HCHO, temperature, humidity, and air quality evaluate.
Freestanding or wall mounted both available.
Rechargeable li-ion battery included.