I've recently discovered the joys of portable speakers, initially relying on the speakers in my phone Ive come to realise that extra oomph however small it might be comes a long way. These rechargeable card speakers should do just nicely, manufactured by IDEA International in Japan they feature a heavyweight metal construction which i absolutely love. Available in matte Gold, Shiny Black and Stainless Steel they are the same size as a credit card and will power up via USB in 2 hours flat. Playtime is rated at 5 hours using the 3.5mm jack input. it also comes with a rather dapper looking travel case. You can purchase them from here.