Thanks for your posting.
There is a box attached to the arduino through USB, what is this box?
It's a battery box with switch and USB connector.
http://akizukidenshi.com/catalog/g/gP-02681/
I use NiMH batery ×4
http://picasaweb.google.co.jp/MeowJPN/ELJ09#5411370403749805426
http://picasaweb.google.co.jp/MeowJPN/ELJ09#5411370414048915682
Photo sensor input, Sound out and Display picture and text,
they are all executed with the AVR ATMEGA328P.
Thanks!