Car use: The EQ equalizer features a built-in isolated boost power supply to ensure signal purity and dynamic range; as an isolated power supply, it can be used in vehicles without concern for common ground interference. Low noise: The 3-band EQ equalizer's signal processing circuit uses a TI NE5532 operational amplifier, delivering high-fidelity o with low noise performance. Synchronous input and output: The mini stereo preamplifier uses an NE5532 circuit for pre-attenuation compensation. Attenuation is -15dB when powered off; upon powering on, NE5532 provides amplification and compensation with 0dB gain, reducing noise interference for improved sound quality. Volume control: The 3-band EQ offers left and right channel balance adjustment, volume control, and high, mid, and low frequency band adjustments; includes a mute circuit with minimal switching noise during power on/off. Wide compatibility: The stereo EQ equalizer input works with electronic devices, turntables, sound cards, guitars, bass, electronic musical instruments, game consoles, and other o sources. Output connects to speakers, subwoofers, o enhancers, reverb units, AV receivers, power amplifiers, headphones, and more. Color: Black Material: Aluminum Alloy Package Contents: 1 x EQ Equalizer, 1 x Power Cable Note: Light reflection and display differences may cause slight variations between the product color in images and the actual item. Measurement may vary by +/- 1-3 cm.