If you enjoy playing the guitar on your iPhone this new speaker design called the Fingerist created by Japan based Trinity, might be just what your looking for. Simply slide in your iPhone or iPod Touch boot up your preferred iPhone guitar application and your away.
The Fingerist is a new iPhone, iPod Touch accessory that allows you to play your app with the feel of musical instrument. It even has a built-in line-out that you can use to connect your iPhone to a larger amplifiers if a little more volume is required for those larger live performances.
Powered by 3 AA batteries the Fingerist will let you rock n roll for around 6 hours non stop and is compatible with both the 3G and 3GS iPhone.