Based class pointer array accessing derived class value C++

So I have a class Product:

    class Product : public Streamable {
    char sku_[MAX_SKU_LEN + 1];
    char * name_;
    double price_;
    bool taxed_;
    int quantity_;
    int qtyNeeded_;
}

I'll skip the irrelevant member functions. And this is my derived class from Product:

class AProduct : public Product {
    char fileTag_;
    char unit_[11];
    public:
    const char* unit() const;
}

I have an array of product pointers:

Product* product_[100]; 

This is an array of Product pointers which means it can also contain AProduct pointers. What can I do to access the unit_ of the elements of this array which are AProduct pointers?

Using (*Product[i]).unit() will result an error because unit() function is implemented in AProduct, and product_ is an array of Product pointers