Fangrui Product Details Input: 1/4inch Single Jack Connector (tip Live, Sleeve Grounded) Or 3-pin Xlr Connector (pin 2 Live), Unbalanced. Parallel Link Output 1/4inch Jack Connector For Feeding Other Devices Directly Or Through A Buffer Amplifier. Attenuator At 0db; At 20db; At 40db Impedance: 1 Mohm 47k Ohms 47k Ohms Maximum Input Level Before Clipping +9dbu +29dbu +49dbu Output: 3-pin Xlr Connector, Transformer Balanced Output. Drive Lines Above 600 Ohms. Maximum Output Level Before Clipping Is +9dbu When Using Battery Or Phantom Power. Frequency Response: 30hz To 20khz, +0/-1db Noise: Less Than -105dbu, Unweighted, 22hz To 22khz, Rmsx Harmonic Distortion: Less Than 0. At 1khz, Odbu Output. Power: Phantom Power Requirement: +20 To +48 Current Draw: Phantom Power, Less Than 8ma. Different Batches May Have Different Appearances, Which Not Affect The Use; Different Light Or Display May Cause Color Difference In The Actual Product Colour:photo Color Material:aluminum Alloy Package Contents: 1x Active Di Box 1x 9v Battery