【specs】 Dimensions (W/D/H): D 8.27\” (210mm) W 3.94\” (100mm) H 2.64 (67mm) Weight: 2.16lb. (980g) Boost On/Off: True Bypass or Buffered Signal Switching (can be set with Dip switches) Power Consumption: 9VDC/10mA(max) Approx. 40hrs continuous use with an alkaline battery Battery Type: 9VDC (006P) x 1 AC Adapter (Optional): 9VDC-18VDC, Negative Tips (Regulated only) Input Impedance: 500k ohm Output Impedance: 2k ohm Nominal Input Signal Level: -20 dBV Nominal Output Signal Level: -20 dBV