Clip-on Noise Filter,VSKEY [10pcs 9.0mm] Anti-Interference High-Frequency Ferrite Core Choke Subwoofer,Speaker,Mixer,Home Audio Device Noise Suppressor (0.35 inch Inner Diameter)

Reinstalled my LED auxiliary backup lights after getting rear-ended but they didn't get along with the new backup sensors and whenever the lights were on the backup sensors would go off like I was right against an object behind me. I really didn't think these would work but they did. Now my backup sensors work normally. I was very surprised and very happy. But like another reviewer said it's really hit or miss it all depends upon what frequency the RF is at.

Got these to block RF on woven cover guitar cables. Measurement of the guitar cable is just under 7mm OD. The 7mm ID chokes will not close over this cable. They work fine over slim audio cables and power cords. Gonna have to probably get the 10mm for them to fit.

I have a 1997 Mazda Protege DX with an aftermarket radio in it, I'm restoring it because it was my mother-in-law's car and she passed away about a year ago and I'm going to restore it and give it to one of the kids,, that being said I installed some hid LED headlights with a ballast after I did that I could pretty much only pick up a couple of radio stations because of all the static when the lights were on.I did some research on ferrite and saw this product which I have now purchased and as soon as I installed them on the lines between the LED ballast in the Headlights about 90% of the static left and I was able to receive my radio stations.I have since purchased more ferrite and installed these on my radio antenna and also on the lines coming out of my alternator, and they seem to do a pretty fair job of reducing that static noise that you get in some vehicles on the radio when your turn signals are blinking on and off and so forth if you're having a problem like this I think they're worth giving a try.

I was already using double shielded heavy duty thick RCA cables for my car audio. I wasn't hearing the typical whirring feedback, but rather a rapidly clicking feedback sound. This product did not help. I believe this product is intended for poorly shielded cables. But if you already have properly shielded cables then your feedback sound is due to some other problem. Nevertheless I tried this other product from Amazon which actually worked for me... https://www.amazon.com/dp/B000BCDQ44/ref=cm_sw_r_cp_apa_i_leZNFb2DDNN88?_encoding=UTF8&psc=1

BUENO

My microwave used to drive my on-demand water heater mad. Without warning the water heater would click relays and start beeping sometimes when the microwave was running. I put four of these on the microwave power cord close to where it came out of the case. Problem solved! It did take four though, still acted up a bit with only three.

These ferrite filters were the ticket to suppress the noise (EMI) on my CNC equipment, easy to install and compact enough to fit in tight spaces.

Had issues with radio interference in vehicles using LED lights. On one vehicle, the LED's were accessory flood lights. These seemed to work ok on them. Still a little static, but definitely an improvement. On the other vehicle I used them on the LED headlights. It didn't change anything. Still the same amount of static. So it's hit or miss whether they will work for you or not.