Rugged, Road-Proof Case - Noise Level (22Hz - 22khz, Input Shorted): -100dbu - Link Output: One 1/4 Inch Phone Jack, Unbalanced - Weight: 0.88 lbs..Ground Lift Switch Eliminates Typical Ground Loop Problems - THD N (10Hz-22khz): 0.01%Typ.@1V RMS,1khz - PAD Switch: 0db, -20db, -40db Setting.Link Output Allows For Direct Connection - Max. Input Level (1%THD): 6 dbu - Ground Lift Switch.Internal Battery Automatically Shuts Down When Phantom Power Is Connected - Input: One 1/4 Inch Phone Jack, Unbalanced, One XLR Connector, Balanced Or Unbalanced - Battery: 9V.Frequency Response: 20Hz - 20kHz - Output: One XLR Connector, Balanced - Dimensions: 6.22 x 3.94 x 1.97 Inch The PDC300 is an active direct box that allows you to convert your unbalanced, high-impedance line to a balanced, low-impedance line for longer cable runs and significant noise reduction. This active box is also specially designed to support a wide frequency spectrum, so you won’t miss out on those low bass tones. It’s powered by a 9V battery that automatically shuts down when phantom power is connected. Input: 1/4 Inch jack; output: XLR jack. Also includes a link output for a direct connection.