• Good property: The core ring is made with a plastic shell and a ferrite core, with a self-adapting inner clip that can be firmly mounted on cables for long-term use. • Optimal size: Size of 3.5mm, suitable for cables of 1.5-3.5mm; Color: Black. • Extensive utility: Applicable to various cables such as AC power lines, USB cable, mouse cable, keyboard cable, headphone cable, video cable, data cable, etc. Excellent for reducing high-frequency interference caused by household appliances and electronic devices. • Unique design: Effectively stops EMI and RFI, creating a clearer signal and faster data transmission. • Tips: Mount them close to the source of interference, near the import and export of shielding cases as much as possible.