Hello, yes, it can be operated while plugged in, and then will run indefinately. We used it as a white-noise player for you baby, and it worked great, going on almost a year of continuous playback now😅

I couldn't get to grips with it and gave it to the second-hand shop.

Mains operation possible. Unfortunately, it hangs with some USB sticks after switching off and on. However, it can be set to "Reset" after inserting another USB stick.

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Yes, a cable is supplied. Charging time 2 to 3 hours

yes