D&rsquo;Addario PW-CT-9V DC Power Adapter &ndash; Minimize Need to Change Batteries on Pedalboard and Other Devices Requiring 9V &ndash; 500mA Max Current &ndash; Tip-Negative, Sleeve-Positive Power Supply BATTERY-FREE PERFORMANCE  You wont 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. VERSATILE - 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. 500mA MAX CURRENT - The tip-negative, sleeve-positive power supply can deliver 500mA to fuel even your most power-hungry devices. PRODUCT INFO - Input: 100-240VAC; Output: 9VDC, 500mA; Barrel size: 2.1mm; Polarity: Tip -; Cord Length: 72; Available in NEMA, F plug and G plug types. DADDARIO ACCESSORIES - For over 20 years, DAddario Accessories (formerly Planet Waves) has been leading the industry in innovative and problem-solving products that serve musicians worldwide. DAddario Accessories are proudly made in a state-of-the-art manufacturing facility to the most stringent quality controls in the industry.