Modifying Singing Greeting Card How To Modify A Singing Greeting Card?

How to modify a singing greeting card? - modifying singing greeting card

Hello to all.

Today I went to buy greeting cards with hope in my locker at school to my locker to sing "every time I sing.

I was curious as to whether to keep the electrical system or removing the card and how. I would like to know if I not able to extend the battery life or be able to change the battery if needed.

Thanks in advance!