Diago 18 Volt Adaptor Input: 9V DC Centre Negative Follows the Boss plug convention of 2.1mm centre-negative barrel plugs for output Output: 18V DC Centre Negative, 30mA Max Works with MXR Stereo Chorus MXR EVH Flanger Dunlop SW95 Slash Wah Work with any 18V DC guitar effects pedal that draws 30mA of current or less