Check the listing for details. (3) Snap-On Ferrite Core FILTERS Reduce Cable NOISE from EMI / RFI. Condition: New. Listed at 15.95 USD. 0707 --> Snap-On 1/4" ID EMI / RFI Filter for Stereo System Cables Stereo & TV cables can pick up EMI and RFI noise like an antenna. (3) Ferrite Core Filters Snap-On Filters reduce or eliminate all kinds of EMI and RFI Noise on your Analog/Digital Audio and Video Equipment. Keep your audio and picture Clear, Clean and NOISE FREE as it was meant to be seen and heard. EMI and RFI stands for: Electro-Magnetic Interference and Radio Frequency Interference 1/4" ID - ideal size for most Power, Audio and Control Cables. EASY to INSTALL: Simply clamp on any Input, Output, Power or ANY Electrical Cable up to 1/4" diameter near your equipment. They are REUSABLE and can be removed and relocated in seconds. [NOTES: Multiple turns will multiply effectiveness. Ferrite Cores DO NOT work on Fiber Optic cables.] Works on ANY electrical cable: Speaker Cables Microphone Cables AC/DC Power Cables Digital Cables Control Cables Typical sources of EMI noise: Electric Motors Fluorescent Lights Electric Fuel Pumps Computers Digital Clocks Typical sources of RFI noise: Cordless / Wireless Phones CB and HAM Radios Broadcast Stations Police and Fire Units Model R/C Transmitters UNUSED. Ships in OEM Bag. Thirty-day return / refund guarantee. Sorry, we DO NOT ship internationally. We DO NOT accept INTERNATIONAL PayPal payments. Feel free to write us if you have any questions. Thank you for looking.