The first of these units I bought would not turn on at all - even with a "known good" power supply. The power adapter that came with the device also worked perfectly, but the device would not turn on at all. I returned it and got a replacement quickly. Unfortunately the plugin only works in receive mode (not in transmit mode) and for my project I had to use it in transmit mode. I also returned it and bought a BTmagic device (https://www.amazon.com/gp/product/B07JZH47B3/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1) which installed quickly and works great.
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