Some questions about the transportation card in Shanghai.

Hi, I have a few questions I just want to make certain of.

1. My husband and I are traveling together in the city, can we buy one transportation card and use it for both of us or do we each have to buy our own? For example, if we get only one card, when we get on the bus I would use it once for myself then pass it to him to charge for himself.

2. To get the card, we only need to deposit CNY 20 is that correct? And we can use that CYN 20 towards transportation costs and the card itself doesn't cost extra? Because in the United States in many major cities you have to pay extra for the card and then deposit extra money in for transportation.

3. When we return the card, they will give us the remaining balance? Will they give that in Renminbi or will they deposit it back into our credit cards? Assuming we will only have a few yuan left on it.