socket, when I got it the screws on the VGA side were missing and my monitor couldn't accommodate an additional computer monitor after plugging it in, I've tried this with my TV which has both VGA and HDMI and it always does don't pick it up yet. I ended up having to buy a dongle that converts HDMI to VGA and it worked great. Whilst this item may have been defective I would not recommend it as I need it for work from home and had to wait a few days for delivery as it was not considered 'essential'.
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