... etc 1,newest calendar desigen:display year, moth, day, time, week;2,the air tester is test VOC, dust bacteria ... pollution,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, ...