... 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, ... , suggesting users open the window to take a breath or leave the room harmful gas: 0-99 0- ... stink, sweat, etc. VOC is test the organic volatic gas in the air, mainly tolunene, xylene etc(home decoration, ...