The Sony Rolly SEP-30BT is a digital media player that allows its users to store 500 songs on the 2 GB built-in memory module. This media device offers a battery life up to 5 hours. In addition, the model is available in white with the following characteristics: 10.49 cm width, 6.50 cm height, 6.50 cm depth, 311.85 gm weight.