HQRP AC Adapter w/ 9V Battery Snap Connector for Electro-Harmonix EHX Big Muff Pi Little Big Muff Pi Metal Muff w/Top Boost Superego Synth Engine Pedal w/Battery Clip Converter + Euro Plug HQRP&reg; 9V Battery Holder with AC Adapter Replacement plus HQRP&reg; Euro Plug Adapter; AC Adapter Input: 100V-240V AC; Output: DC 9V, 300mA; Safety Features: High Efficiency and Reliability; Automatic Overload cut-off; Automatic Thermal cut-off; Short circuit and Over Voltage protection; Low Interference & Noise; 1 Year warranty!