WPC-22: 5 to 45 °C (41 to 113 °F), 5 to 90% relative humidity, non-condensing Storage environment –20 to 60 °C (–4 to 140 °F), 98% relative humidity, non-condensing (maximum) Altitude 2000 m (6562 ft) maximum Power requirements 230 VAC ±15% , 20 VA, 50/60 Hz Detection method Light blocking