Connection method Two options: input and output through a 3.5 mm headphone jack, or direct wiring via two blue wiring jacks Parts selection Uses two audio channels Transformer material is from aerospace materials Line design and size Stereo twochannel design Circuit board specifications: 45 mm x 30 mm Very small footprint, suitable for small cars and other interior installations Performance and benefits sensitivity and reduction 10 20 dB higher sensitivity than similar lowend models Full tone and quality Practical use scenarios In a compact car, connect a 3.5 mm audio source to an external amplifier or head unit using the headphone jack In custom interior installations where routing constraints favor direct wiring, use the blue wiring jacks for clean wiring In smallspace installations such as dash or underseat setups, take advantage of the 45 mm x 30 mm board size for discreet placement