Logitech Rechargeable Speaker S315i $49 (Free Postage)
1 Unit maximum per customer
http://www.logitechshop.com.au/logitech-s315i.html
Up to 20 hours of music from your iPod® at home or on the go.
A mobile music marathon—this portable speaker lets you listen to up to 20 hours of music wherever you go.
It plus into the wall to charge.
Reviews:
http://www.cnet.com.au/logitech-rechargeable-speaker-s315i-3…
http://reviews.logitech.com/7061/5849/logitech-rechargeable-…
It has a built in, rechargeable, battery. So plugs into the wall to charge, then can be used anywhere, anytime to give you hours of music. It's fairly thin/sleek shape so easy to take away in a carry bag etc as well. It has 3.5mm line in so you can also use it for portable DVD Players, MP3 players etc as well.
what battery does this thing run on? and does it have the option to plug into the wall?