Sony has unveiled a slate of new Walkman MP3 players today, with the launch of its B170 Series. Available in both 2GB and 4GB varieties, these new devices weigh in at just 28 grams, but apparently pack plenty of punch, providing up to 18 hours of listening on a full charge. If you’re pressed for time, though, you can just plug it in for three minutes, which, in turn, will give you a full 90 minutes of listening time. There’s also an onboard equalizer, voice recorder and USB port, as well as a dedicated «Bass Boost» that, as you may have guessed, will boost your bass. No word yet on pricing, but Sony says its new Walkmans will be available sometime this month. Full PR after the break.