1. Parts Selection: Two independent audio are used, and the transformer material is selected from aerospace materials.2. High sensitivity and high reduction, 10-20DB higher sensitivity than similar low-end , full tone, pure sound quality.3. Line design: stereo two-channel independent design, circuit board specifications: 45MM X 30MM, very small, suitable for small cars and other interior installations.4. Connection method: Two connection methods, which can be input and output through a 3.5MM headphone jack, or can be directly wired through two blue wiring jacks.5. Main function: Eliminate current sound. A common ground-isolated audio transformer eliminates current noise from the AUX common ground. The output and output ground lines are isolated by the transformer and there is no common ground.Descriptions:1.This is a an audio common ground isolator module.2.It is effective for the noise caused by the common ground for the audio source and the receiving device.Specification:Name:Audio common ground isolatorColour:As shownMaterial:PCBSize:55x30x20mmPackage Contents:3 x Audio Stereo IsolatorOnly the above package content, other products are not included.Note: Light 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.