Sonoma Wire Works GJ2USB GuitarJack 2 USB Portable Audio Interface 1/4 inch (6.5 mm) mono instrument input - nickel-plated, solid brass Switch craft (10,000 MTBF) jack 1/8 inch (3.5 mm) stereo mic/line input - (no phantom power is provided) 1/8 inch (3.5 mm) stereo headphone/line output with increased drive for headphones provides incredible sound quality Micro USB connector. Includes 2 detachable cables: Micro USB to USB and USB OTG Device powered for ultimate portability - requires no batteries or power adapter