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The Ernie ball Volt power supply powers four 9 Volt guitar pedals and one 18 Volt pedal, you can connect 5 pedals total. You can also connect 2 Ernie Ball Volts together, to connect more than 5 guitar pedals. These ensure the best noise canceling in my experience which is what you're looking for for if you have noisy pedals like the JHS Emperor V2 Chorus pedal and compressor pedals. The Volt easily velcro-es to fit underneath Pedaltrain Nano pedalboards. Though I have more expensive power supplies, this one cancels noise better. Best value in power supplies and in the smallest size*. It does what you'll hope it will do, which is eliminate hum and radio signal interference to connect your guitar pedals on your pedalboard. This one in my opinion is the power supply we can buy and foreseeably always will be