Diago AC adapter cable, to power up to 6 effects pedals simultaneously, strong and durable, input socket: 2.1 mm center negative barrel plug (Boss-style), output plug: 2.1 mm barrel plug, polarity of the output connector : center positive, polarity reversed to center +ve, 2.1mm barrel plug, you can buy as many as you need, one for each pedal, just connect your daysi chain cable.