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I can lock/unlock my car 2 stories up at work just pointing at the window. I can also do this in my bedroom [Z is about 20 feet away], pointing in the opposite direction and there are also blinds on the window. I've always had good luck with alarms.
when you hold the remote up to your chin it kind your skull acts as a dish and it reflets the beam better, kind of like a satellite dish....therefore better range....my range tends to be about 50 feet or so.....