GP1 is a portable guitar plug amplifier with distortion sound. You can play your electric guitar anytime, anywhere. Plug your headphones and enjoy your GP1 with a British Rock distortion. Also you can adjust the gain and tone level for different tastes. <br><br>Features: <br>Compact and light-weight design, easy to carry. <br>Built-in distortion effect. <br>Designed with 3 adjuster: Level, tone, gain. <br>0.25in plug, just plug into guitar jack, no need of installation. <br>Powered by two AAA 1.5 alkaline batteries