Hi

The following will all affect I/R. Plasma, LCD's, Sunlight, Flourescent, Energy Efficient Lightbulbs (really bad!) and from what we've experianced this year ...............................................Pronto's putting out to much I/R!!! This seems to "blind" the receivers. Hope this helps. If you would like more Xantech info then we have our own forum site (recently launched) at www.martekuk.co.uk