Sonoma Wire Works GuitarJack Model 2 1/4-Inch (6.5 mm) instrument input - nickel-plated solid brass Switchcraft (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 Dock connector designed for use without removing most cases Sleek and rugged aluminum shell