10pcs Clip on Ferrite Ring Core Anti-Interference High-Frequency Filter RFI EMI Noise Suppressor with 5mm Inner Diameter Ferrite Cable Clip Black

Good

Installed my rear dash cam and after tucking all the cable away my DAB reception was awful so read online about it which led me to purchase these. I fit a couple on the wire near the DAB receiver at the rear and one on the front where the wire plugs into the front dash cam. Much improved reception although still some interference occasionally

Did the job

Worked a treat removing interference for my scanner. I was getting battery charge noise from the power cable in my caravan. Fit, click noise gone.

Does what it supposed to