The Sony Walkman NW-MS7 is a digital media player that allows its users to store 16 songs on the 64 MB built-in memory module. This media device can also offer a battery life up to 4 hours. In addition, the model is available in indigo with the following characteristics: 3.70 cm width, 9.62 cm height, 1.93 cm depth, 68.04 gm weight.