The Signal Flex PS9 converts standard 120 volt AC power to 9 volt DC power, for 5 separate pedals. It does the job of 5 separate 9 volt power supplies, which eliminates 4 power cords and saves space on your pedal board. The PS9 power converter is internally fused to protect your equipment from harmful power surges. All 9 volt output lines have negative center pin polarity.