3.5mm Cable Ground Loop Noise Isolator: Anti-Interference Accessory for Stereo Car Audio Eliminates buzzing noise caused by ground loops when the audio source and speaker share the same power source in car speakers or home stereo systems, especially when using a Bluetooth receiver. The noise isolator works by reducing current noise to deliver clear audio performance in car or home audio setups. Compatible with any portable device featuring a 3.5mm audio jack. Ideal for use with car audio systems, home stereos, Bluetooth receivers, or Bluetooth hands-free car kits where grounding issues occur. Directional design: one jack serves as input, the other as output. Can be used from either side. Audio input: stereo Frequency response: 20Hz–20kHz Audio interface: 3.5mm Color: black Material: ABS Size: 11 x 7 x 3 cm Package Contents: 1 x Noise reduction cable Note: Light and display differences may cause slight color variation between the image and actual item. Measurement tolerance: ±1–3 cm.