This is the first model of the BOSS PSA-100, rated PSA-100. Two units are included. I tried connecting them, but they didn't power on, so I'm selling them as junk items. Please consider this before purchasing. Use them for repairs or experiments. BOSS PSA-100 AC adapter, DC9V output, 200mA. - Model: PSA-100 - Input Voltage: AC100V 50/60Hz 8VA - Output Voltage: DC9V 200mA - Brand: BOSS - Country of Manufacture: Japan Thank you for looking.