Today Sony has unveiled the new Walkman B series MP3 player. The B170 series weigh just 28 grams and gives you up to 18 hours of non-stop music on full recharge. When you're in a hurry, just plug it in for 3 minutes and it gives you 90 minutes of listening time. Walkman B Series features a chunky clip that attaches to a belt, bag strap or clothing, USB port, on-board equalizer, a voice recorder and dedicated Bass Boost button. The new Walkman B170 Series of MP3 players will be available sometime in this month in 2GB or 4GB varieties.