HiTec X4 AC Plus 300. This is being sold because the cell balance is poor and unsatisfactory. According to my father, the difference is about 10%. He says it's been like this since he bought it, and he doesn't know if it's a product defect or a specification issue. He says it can still be used by someone who doesn't mind or for other purposes due to its many functions. I am selling this on behalf of my father, so I don't know the details. Please purchase this if you have the knowledge to resolve any issues. This is a used item, so there are scratches and dirt. Please refrain from purchasing if you are concerned about this. Please forgive the amateur packaging. I cannot provide technical support for its use. I am assuming that those who think "as long as the product works" will purchase this. Please examine the photos carefully and purchase with no claims and no returns. Type...Radio control car