http://www.xotic.us/effects/ac_booster/
Specs
Dimensions (W/D/H): 4.39" x 2.38" x 1.98" (112mm X 60mm X 50mm)
Weight: 0.6 lbs. (280g)
True Bypass Switching
Power Consumption: 9VDC/6mA
Battery Type: 9VDC (006P) x 1
AC Adapter (Optional): 9VDC, Negative Tips (Regulated recommended)
Input Impedance: 500k ohm (min)
Output Impedance: 10k ohm