This is a simple product. I use it with my W300i and it does exactly what it is supposed to do. Plug it into your phone and then your USB port on your computer, a PC or laptop works fine, and treat your phone's memory as a mass storage device. It makes your phone look like a flash drive that you can drag and drop files to. Use it to transfer ringtones, wallpapers, themes, videos, or whatever else. The files don't even have to be usable to the phone itself to store them on it either.