Hello!
I know this is rather old, but I just saw it recently.
I have one of these little toys, and opened it up to check.
The marking is "MZ81".
It's a bit difficult to get voltage readings on the pins, but in Standby I get
1.12V 0V
12.35V 12.35V
12.35V 12.35V
The AC adapter measured 12.35V......
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