Application Occasions of This Great Noise Attenuator 1.Great for blocking RF-interfere 2.If you have computer interference around your computer, get a set and use them,they work. 3.If you are a ham radio operator and the antenna is in your attic.Put them on USB cables, power cables 4.Fixed LED light...

Specification: 1.Color: black
 2.Material: Core-ferrite, Hosing-plastic

 3.5 different size 3.5mm/ 5mm/ 7mm/ 9mm/ 13mm inner diameter fit different usage:
 *3.5MM (inner diameter): suitable for 1.5-3.5mm cables; Application: Car DVR, Headset Cable, Loudspeaker Cable, Mouse Cable, Keyboard Cable, US...

These ferrite cores work to erase noise that is generated by a portable device or equipment that would otherwise be propagated around them. They also work as a filter to get rid of those noises generated by other devices so that your notebook PC does not get those noises that would otherwise cause m...