Options on the review form include Clear and Thick. I can't believe these numbers matter to anyone, but yes, this thing is small. You can see in the photo - this is the width of the USB connector, and the PCB is about twice the length of the connector itself. It's not much, but it's much more interesting that it worked. These are really cheap little USB->UART devices with a connector specially designed for the ESP8266, including a switch to select programming mode or operating mode. That's it. I programmed a dozen ESP8266 modules and kept them in my desk drawer while waiting for my next project. glad i bought it.
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