Technical Parameters ·Operating Voltageï¼?AC 220V±20% & DC 24V ±15% optional 12V ·Working temperatureï¼? - 20â??ï½?+60â?? ·Relative humidityï¼? ï¼?95% ï¼?25â??ï¼? ·Work patternï¼? continuous ·Power dissipationï¼? ï¼?20W ·Comprehensive errorï¼? â?¤Â±3% ·Alarm control errorï¼? â?¤Â±3%