This is a 9V fixed-voltage MyVolts-branded power supply adaptor designed to meet exactly the power specification of your Marshall JFX-1 Effects processor.Specifications:- Output voltage is 9V- Max. output amperage is correct for your device- Output tip is the right size and specification - we've tested it thoroughly- 2-pin plug for use with the Type C (EU) wall sockets- Input voltage is AC100-240V, 50/60HzIn addition, this -branded replacement power supply for Marshall JFX-1 Effects processor is:- Compliant with all safety standards, and features overvoltage, overcurrent and short-circuit protection to protect your device from damage- RoHS and CE-certified- Energy Star level 6 approved, guaranteeing more efficient delivery of power to your devices, at less cost to you- Covered by a 2 years' warranty: if the power supply fails within 2 years from the date of purchase, we'll replace it, no worries.