These are small replicas to the Alvin and the chipmunks plush toys by Gemmy. When you squeeze their tummies, they play a small segment of "The chipmunk song". They DON'T dance since they are small items.
Since these are small versions of the animated plush Alvin and the chipmunks, the battries are NOT replaceable so the battery size they take is unknown.
The version of the Chipmunks used was the 60's version from "The alvin show"
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The mini alvin& the chipmunks plushies are musical toys made in 1998. When you squeeze their...