[1] Application Overview REX-BTPM25V is a Bluetooth air quality monitor equipped with a PM2.5 sensor module manufactured by SHARP. To measure the amount of scattered like the smoke of pollen, house dust, cigarette floating in the atmosphere, to display the AQI level of concentration and 6 stage. [2] feature · PM2.5 · PM10 · VOC to the measurement, display a numerical value and clean degree - the temperature, humidity, intensity, pressure · UV measuring, displaying numbers - corresponds to the "