This MP3 Player is crafted for you, especially keeping in mind your taste for style. This music player is made of a single piece of aluminum and is very convenient to carry around as it can be clipped to shirt, jacket, or even a purse strap.It has no built-in momery but you can store your music with the help of Micro-SD / TF card slot. Player Music Also can use as TF Card Reader Format supported MP3 audio format.etc Operation System WINDOWS 98/2000/XP/7/8,etc .Battery is Built-in and is rechargeable(Li-ion battery,) directly connect with PC via USB cable for re-charging. Dimensions of the player are 40x28x12mm .Charging time is about 2 to 3 hours. You can charge by connecting it with the USB cable to the PC. It is available in Random color. Note it can support 8GB micro SD card, not more than that.