LG MM-535

This might seem like a stupid question to most, but i had a couple questions about the MP3 player. To my understanding its going to have a MP3 player built in. Is this MP3 player going to be like and actual MP3 player i can download full songs onto and use it just like my MP3 player right now. I understand that you can buy a mini-sd card, but i just wondered how it worked. Also if this is true that its going to have it, the battery life will be shorten considerabley from listening to it. I for one, am going to need an extended life battery!