Using BA3121 dedicated ground isolation chip, stereo 2 input 2 output, suitable for connecting computers, mobile phones, game consoles. The two inputs can input two different audio sources at the same time, and plugging in at the same time not affect each other. The output is also, you can connect two headphones or two power amplifiers at the same time. With common ground isolation. Dual-channel two-way input and mixed output Two-way output can drive headphones or active speakers. Parameters: 3.5mm Stereo Jack Power Supply:DC5V Power consumption: 0.5W Frequency response: 20HZ - 20KHZ Input impedance: 55K Output impedance: 16-600 Gain:0db :0.002% Colour:Black Material:aluminum alloy Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Ground Noise Isolation Amplifier 1 * USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.