HOW TO USE: Download the Ampli Tube free app from the iTunes App Store. Plug the adapter into the headphone jack of your iPhone, iPod and iPad. Plug your guitar or bass into the adapter 1/4 jack. Plug your headphones or external speakers into the adapter headphone jack Now launch AmpliTube Free and start rocking Features: 1/4 female mono input jack connector. 1/8 female stereo output mini-jack connector. Connect electric guitar and bass. Also works with line level signals from synthesizers, keyboards, mixers. Pack of 1 piece. Black colour.