This toy has one switch that causes fluid and glitter inside the doll to spin while it lights up. 

It makes a gentle whirring sound but does not sing.

 

Before adapting it, consider checking with the individual or organization that will receive the toy to find out if they would prefer a toy with audible feedback. That may be the case for children with visual impairment. 

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Its internal wiring is not particularly complicated, but all of its wires are very small and difficult to strip or solder. Recommended for those who are already fairly comfortable soldering, rather than as practice for those who are learning how.