Features: The XH-M372 Stereo Auditory Isolator features advanced common ground a interferences resistant technology, effectively eliminating electrical noise and background noise enhances auditory sound. Selection of parts: two independent auditory transformering used, and the transformee ffrom aerospace materials, which have high sensitivity and high reducibility, 10-20dB higher sensitivity than similar low-end transformering, full timbre and sound quality. Circuit designing: Stereo two-channel independent design, circuit board specification: 45MMX30MM, very small, suitable for small space and other car interior installation. Connection: two connection ways, which can be input and output through a 3.5MM earphone socket or directly connection through two blue connection socket. Main function: eliminating current noise. The common ground isolation auditory transformering eliminates sound caused by common ground, and the output and output ground wire isolated by the transformering, so there will be no common ground. Specifications: Model：XH-M372 Stereo Auditory Isolator Size：about 45MMX30MM/1.77x1.18in Sensitivity: 10-20dB higher sensitivity Package Includes: 1PC XH-M372 Stereo Auditory Isolator note: Due to the problem of lighting effects, there is certain tolerances in product, please understand. Please allow 0-1cm error due to the measurement.