... carry, easy to operate, it can be used for iPhone 4, iPhone 3GS, iPhone 3G, iPod touch 4, iPad, iPad2 etc.Features:Small ... headphones jack.The 3.5mm input plug connects to your iPhone.Compatible with iPhone/iPad apps: effects, tuners, metronomes, tone generators, recorders, amps ... etc.It can be used for iPhone 4, iPhone 3GS, iPhone 3G, iPod touch 4, iPod touch 3, iPod touch ...