World's smallest full-range rechargeable guitar amp

NFA Technology, Inc.

The Stealth Amplifier -- Palm-sized high performance rechargeable amplifier combo is
..... the world's smallest full-range battery guitar amp ... 9" x 4-3/4" x 2"

U.S. Patent nr 7,796,774

"From simple rules follow complex behavior, and now, also convenience

...because at NFA Technology FORM follows FUNCTION...WITH STYLE