Unfortunately you will always need to check the recommendations for each wireless device. Many a problem folk buying off ebay and buying old expanders.
Light and temperature values are a bit of gimmick from many manufacturers as you can't use them currently but that's coming
In that thread to which you refer the XT if I recall correctly it was stated that the XT was better than some PIR's inaccurately, but in fact if you research the products correctly you will see progression IR XT QD DT and the device Price is reflected accordingly. So you would expect a basic IR to be cheaper than an XT an XT to be cheaper than a QD and a DT to be the most expensive.
Light and temperature values are a bit of gimmick from many manufacturers as you can't use them currently but that's coming
In that thread to which you refer the XT if I recall correctly it was stated that the XT was better than some PIR's inaccurately, but in fact if you research the products correctly you will see progression IR XT QD DT and the device Price is reflected accordingly. So you would expect a basic IR to be cheaper than an XT an XT to be cheaper than a QD and a DT to be the most expensive.
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