... bacteria, stink,weat, etc; 3,display the calendar. Air tester PWJ-5P(display the air pollution index)1,newest calendar ... ,suggust users open the window to take a breath or leave the room VOC(volatile organic compound): ... , suggesting users open the window to take a breath or leave the room harmful gas: 0-99 ... open the window to take a breath or leave the room Our air tester bacteria, dust, stink, sweat, ...