Roland/BOSS PSA-120 Features
Capable of powering any BOSS effect pedal, including those with digital circuitry.
Converts AC wall current to 9 volts DC current. Power supply designed to operate a multitude of BOSS and Roland products.
Regulated with a higher milliamp rating for use with digital equipment.
Output: DC9V (regulated), 500mA
Tip negative, sleeve positive
3-meter cable
Status light that flashes if there are grounding problems
Small footprint (similar to a cell phone charger)

 
Type:Roland/BOSS Power Adapter
Input Voltage Range:100-240V AC, 50-60Hz
Output Voltage:9V DC
Output Amps:500mA
Polarity:Sleeve: Positive, Tip/Center: Negative
Compatibility:Roland/BOSS devices
Manufacturer Part Number:PSA-120S2