... , stink,weat, etc; 3,display the calendar. Sell air tester PWJ-5P1,newest calendar desigen:display year, ... and blue light will alarm, remind users that air has reached thelevel pollution,suggust users open ... display light show red will alarm, remind users that air has reached the level of pollution, suggesting ... is red, it will alarm, remind users that air has reached the level of pollution, suggestion ...