... moderate/poor based on the CO2 measurement u Two alarm ways: buzzer alarm and backlight Colours switch u Provide optional 1xrelay ... ℃(-4~140℉) Humidity measuring range 0~99%RH Relay output (optional) One relay output with rated switching current: 3A, resistance load ... temperature and humidity monitor/controller Three-color backlit LCD, buzzer alarm; 1 on/off output; touch-key for operation 100~240VAC ...