TECHNICAL SPECIFICATIONS: Input impedance: 1M ohm Output impedance: 1K ohm Power supply: 9V DC Minimum power supply voltage: 8V DC Maximum power supply voltage: 13.5V DC Current draw @ 9V DC: 7.0mA Battery type (included): 9V Battery 6F22 Alkaline Controls: On-Off, Drive, Tone, Volume External connectors: Input Jack, Output Jack, 9V DC Jack (Central pin negative) Switching method: True by-pass Dimensions (d,w,h): 96x125x60 mm Weight (battery not included): 560 g