The "sensor" is clearly not a simple phototransistor, it is presumably a "photo-logic" device but I can see no reference so far in the various eBay and Aliexpress listings as to its identity. It is not a 38 kHz sensor.
When the couple I am in the process of ordering from another (much cheaper) Aliexpress listing arrives in three weeks, I suspect I will be none the wiser as I doubt it has identification markings. 
Hopefully they do not come from Wuhan! 