... ,real-time display air ppllution index; 2,the air tester is test VOC, dust bacteria, stink,weat, etc; ... year, moth, day, time, week;2,the air tester is test VOC, dust bacteria, stink,weat, etc;3 ... pollution,suggust users open the window to take a breath or leave the room VOC(volatile organic compound): ... open the window to take a breath or leave the room Our air tester bacteria, dust, stink, sweat, etc ...