The specified range is only valid outdoors in open air. Inside your house the operating range is limited by the number and type of walls and/or ceilings in between (see table below).
Change the position of one or both units to optimize the range.
|Dry materials||Material Thickness||Loss of range|
|Wood, plaster, cardboard, glass (without metal, wires or lead)||< 30cm (12in)||0-10%|
|Brick, plywood||< 30cm (12in)||5-35%|
|Reinforced concrete||< 30cm (12in)||30-100%|
|Metal grilles or bars||< 1cm (0.4in)||90-100%|
|Metal or aluminium sheets||< 1cm (0.4in)||100%|
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