BATTERY FREE PERFORMANCE – You won’t need to worry about dead batteries in your pedalboard ruining your performance when you use an AC-DC 9-Volt power adapter. You can ensure a consistent, battery-free performance when you directly power it
9V POWER SUPPLY FOR GUITAR PEDALS - The D'Addario 9V Power Adaptor works with pedals and other devices requiring 9-Volts to minimize the need to change batteries.
VERSITLE - The Adapter converts AC wall power to 9-Volt DC for powering most instrument pedals and other 9-Volt battery devices. The D'Addario Adapter can also be used to power tip-negative keyboards
SPECS - Power Input: 100-240V AC; Power Output: 9V DC, 500 mA; Barrel Dimensions: 2.1 mm; Polarity Orientation: Tip "–"; Cable Length: 72 inches; Offered in NEMA, F Plug, and G Plug configurations.