Boss EV-30, Dual Expression Pedal, Compatible with stereo phone jacks of compact pedals, multi-effects, keyboards, MIDI controllers and more., Polarity switch allows use with most devices that support expression-control, Impedance: 10kOhm, EXP 1 Out 6.3 mm, EXP 2 Out 6.3 mm, Dimensions (W x D x H): 80 x 192 x 58 mm, Weight: 780 g, Stereo jack cable included