If you find that you are always buying batteries and you think a power supply would be better money spent. Then here's a guide on how to find a power supply for a toy.
Look on the toy for sticker that should have the power rating it requires. There should be 2 numbers. For example if the sticker states 5V 2A. The 5V is the Volts you should always match this up exactly. The 2A is the amount of current the device needs and this just needs to be at least the same or over, so a power supply putting out 2A or 5A it should work fine.
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