Roland MOBILE CUBE the All-Purpose Portable Amp at NAMM
http://www.roland.com/products/en/MOBILE_CUBE/index.html Roland MOBILE CUBE, the small and mighty stereo amp can handle all types of electronic instruments and audio devices, and can be used anywhere, anytime. Connect microphones, electric and acoustic guitars, keyboards, drum machines, MP3 players, you name it, and jam for up to 15 hours.
http://www.roland.com/products/en/MOBILE_CUBE/index.html Roland MOBILE CUBE, the small and mighty stereo amp can handle all types of electronic instruments and audio devices, and can be used anywhere, anytime. Connect microphones, electric and acoustic guitars, keyboards, drum machines, MP3 players, you name it, and jam for up to 15 hours.