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Technical specifications TECHNICAL SPECIFICATIONS Duet II display This product is intended to be used indoors in a domestic or small office environment. It is not suitable for outdoor use. It is intended to be installed by a qualified installer only. Model DU4 Rated voltage (display) 5Vdc and / or 3 x AAA 1.5V alkaline batteries Rated voltage (power supply) 230Vac, 50Hz Input power 0.5W Operating temperature 0 to 40OC Operating humidity range 85% non-condensing This unit has been tested and conforms to the following standards: EN 300 328 V1.7.1 (2006) EN 55022:2006 EN 301 489-17 V2.1.1 EN 61010-1:2010 (3rd Edition) 23