When I was looking for a cheap mini projector, I came across this hybrid all-in-one with a built-in Bluetooth speaker. should come at a price, but added a bluetooth speaker and power adapter. I can't go wrong with the price.
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TV Tuner LUMAX DV-2120HD
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Kohree 36V To 12V DC/DC Converter Regulator - 10A 120W Golf Cart Voltage Reducer
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