1 PCS Ground Loop Noise Isolator for Audio Systems Eliminates hum and buzzing noise caused by ground loops when audio sources and speakers share the same power supply, ensuring clear and pure sound quality. Ideal for use with car audio systems, home stereo setups, and any device with RCA or 3.5mm audio jacks. Delivers clean audio performance without signal loss, suitable for mono and stereo applications. Compact, lightweight, and portable design allows for easy installation and storage. Plug-and-play functionality—no external power or batteries required. Simply connect between your audio source and amplifier or speaker system. Compatible with a wide range of audio devices that feature standard RCA or 3.5mm connectors. Note: This device is designed to reduce noise caused by ground loops and common ground interference only. It may not eliminate noise from other sources. Users should verify the origin of the noise before use. Specifications: Size: 75 x 37 x 21mm (2.95 x 1.46 x 0.83 inches) Color: Black Material: ABS Package Includes: 1 x Audio Noise Filter (Other accessories not included) Note: Actual color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.