Made in Petaluma, California with the World’s Finest Materials 100% Discrete Class-A Circuit Provides the tone & feel of plugging directly into a high-quality tube amp RFI Filtering minimizes radio-frequency interference and noise Provides guitar with a resolute load which segregates it from the many variables on a pedalboard and the long cable run to a back-line amplifier, for consistent tone and feel On/Off Status LED 9-18VDC External Power Jack Input (power supply not included) Input Impedance: 1M Ohm Output Impedance: 150 Ohm Buffer Design: Discrete Class-A Nominal Operating Voltage: 9-18VDC Maximum Operating Voltage: 20VDC Typical Current Draw: 10mA @ 9VDC DC Adapter (not included): WARNING!!! To avoid immediate damage and voiding the warranty, the External Power Supply MUST be 9-18VDC with a NEGATIVE CENTER and a 2.1mm x 5.5mm Barrel Plug Weight: .267 lbs (121.1 g) Dimensions (W x D x H): 1.42 x 3.98 x 1.24 inch (36 x 101 x 32 mm)