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This serial to WiFi converter works great for my intended use. I deducted one star because there was absolutely zero documentation shipped with the unit; the "user's manual" and a couple of useful testing and setup apps (Windows) are only available on-line after a search. The downloaded documentation was, of course, in broken English. It took a while to understand enough to do what I wanted. In fact, another document for another product was needed to get the full picture. Commendably, there were two serial cables (including a null modem cable) plus a 3-foot Ethernet cable in the box, as well as a 5-volt DC switching power supply "wall wart". I plan to use this on my boat to wirelessly transmit NMEA GPS and AIS data from my Standard Horizon GX2200's RS422 output to a laptop and/or an Android phone on the boat, both running OpenCPN. This works well with the device in AP "transparent" mode. As icing on the cake, the unit can SIMULTANEOUSLY operate in STA mode and join my home network over WiFi where I can "see" the same data on my home laptop. Of course, this took a bit of head-scratching and experimenting to get working. All in all, this seems like a very capable device, once you understand how to set it up.
Item works as expected. However, the lack of instructions in the box made setting it up kinda hard. A quick google search for the model number found an English manual. From there, it was relatively easy to set up and get working for my application.
I used to use a wired Serial to Ethernet adapter, but after a lightning strike found its way into my house network through that Ethernet cable, I decided to switch to a wireless adapter. This works exactly as I wanted.