These were working when I last used them over a year ago. Since then, they’ve been in storage - I’m now having a clear out. The pass through power line adaptor TL-PA4020P now doesn’t light up when plugged in. So, unless you know how to fix this, this doesn’t work. The two extenders (TL-WPA4220) do however work. As these can be used as additional extenders, this item is being sold for the working pair of ‘extenders’ (rather than passthrough power line adapters - which is not working, unless you can fix it). One of the extenders has residue from a sticker and one has a drop of paint on the bottom corner - please see photos.
eBay