RFI Noise Ferrite Core Filters Function: This single clipon ferrite core filter reduces electromagnetic and radio frequency interference without compromising the transmission signal, delivering uninterrupted audio, video, and photo experiences. Compatibility and sizes: Available in 17 mm and 24 mm sizes to fit a variety of devices and wires for wideranging applications. Installation and durability: Snapon magnetic ring design for easy, hassle installation with no wire locking concerns. Wearresistant shell provides longlasting performance even under temperatures. Use cases: Home theater and AV setups to minimize RF noise on HDMI and video cables. Cameras, camcorders, and audio gear to maintain clean signal quality during recording. Field or outdoor shoots with portable equipment to improve transmission stability in RFrich environments.