Relax and Listen to the clear soundsA small and light weight walkman that will allow you to move freely.Has 4 gigabytes capacity, with Chargeable Lithium battery that lasts for 23 hours, elegant and simple design. Fast Charging, 3 minutes charging will last for 1 hour, USB 2.0 input, and comes with FM radio Works with the following extensions..MP3, WMA, AAC