... /poor based on the CO2 measurement u Two alarm ways: buzzer alarm and backlight Colours switch u Provide optional 1xrelay ... switching alarm. u Hotel, exhibition hall, hospital, shop, restaurant, air port, train station, theater and other public places u House, villa ... temperature and humidity monitor/controller Three-color backlit LCD, buzzer alarm; 1 on/off output; touch-key for operation 100~ ...