The gp32 draws the needed mA from batteries but a wall powersupply outputs the set amount so it wont just draw the needed power but if your running it over 1amp i dont think thats a good idea.
The gp32 only needs a very small amount of power thats why it last ages on 2AA batteries
As an electronics technician, I can say with absolute certainty that it won't blow up (at least not because of a higher amp rating). Generalmx was right. The device will only draw as much current as it needs.
You will only have a problem if the power supply has a LOWER amp rating than the device you're trying to power.
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