Roland - PSA-120S2
The Roland 120 adapter converts AC wall current to 9 volts DC current. If you want to save money on batteries and ensure stable performance gig after gig, the PSA-120 adapter is the recommended power supply unit for products including many Roland/BOSS compact pedals, the DB-66/88 metronomes, FC-Series foot controllers, MC-202, SH-101, SP-202, TR-626, and all TU-Series tuners. Capable of powering any BOSS effect pedal, the Roland/BOSS PSA-120 can also power equipment with digital circuitry.
Input: AC 100V-240V/50-60Hz; 4.5W
Output: 9V regulated DC; 0.5A; pin [center] = negative