Features: Have 2 unbalanced input interfaces, which is a 1/4inch (6.35mm) interfaces, and is used to connect musical instrument or other unbalanced signals sources, such as electric guitar, keyboards. There is also 2 balanced output interfaces, which is used to connect the Mixers, Sound interfaces or other devices that need to balance the signals input. The input and output is equipped with isolation to isolate the ground Currents, and there is also 1/4inch interfaces, which can send unprocessed signals to other devices, such as amplifiers on the stage, for on-site monitoring.Frequency response: 20Hz-20kHz, which can ensure the integrity of Sound signals and enable high and low frequency signals to transmitted.Input and output impedance: the input impedance is 50k and the output impedance is 600, which help to reduce signals reflection and ensure effective signals transmission.Pad: used to reduce the level of input signals to prevent signals overloads. Attenuation values is 0dB and -20dB -40dB.Ground Lift: It is used to disconnection the transmission of Pin1 on box to prevent Currents from flowing between microphones preamplifier along the shielding, thus disconnecting the ground and eliminating noises such as caused by grounding problems.Specifications: Component:MetalFrequency response: 20Hz-20kHzInput and output impedance: 50k 600Size:Approx.123x89x40mm/4.84x1.57x3.5inchPackage Includes: 1Pc Sound Isolator