The amperage is not the problem here. It's OK, all other things being correct, to have a power supply with an amperage rating higher than you need. The device only draws the power it needs.

The polarity is critical, as mentioned.

The voltage is the problem with your two suggestions. You need a power supply rated at 3 volts.
2.4 is probably too low (brownout) and 5.9 could damage the device. However, if the device accepts rechargeable batteries, 2.4 may be OK since a rechargeable battery is 1.2 volts, as opposed to a non-rechargeable one that is 1.5 volts.


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