... VOC, dust bacteria, stink,weat, etc; 3,display the calendar. 1,newest calendar desigen:display year, moth, ... day, time, week;2,the air tester is test VOC, dust bacteria, stink,weat ... 121-181(red light) represent air has reached the level of pollution 181-250(blue light) ... stink, sweat, etc. VOC is test the organic volatic gas in the air, mainly tolunene, xylene etc(home decoration ...