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 50kΩ and the output impedance is 600Ω, 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:Metal Frequency response: 20Hz-20kHz Input and output impedance: 50kΩ 600Ω Size:Approx.123x89x40mm/4.84x1.57x3.5inch Package Includes: 1Pc Sound Isolator note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.