For Pinnacle Movie Box Deluxe you need an AC Adapter that looks similar to this one: DVE DSA-S15-03 A AC ADAPTER 3.3VDC 3A Genuine SWITCHING AC ADAPTER. This contains the right voltage and amperage for your device to be used. However, I have seen users who plugged a 5V adapter, and everything worked normally. Just make sure to check the Amperage because that's the problem. You can have a higher voltage while keeping the amperage down.
