I've seen this device stop surges and sacrifice itself if the center conductor of a coaxial cable breaks. Since then I've been using them in a building that is very vulnerable and experiences annual surges during thunderstorms. I use this to protect my cable modem for spectral internet and use it outside the building. However, make sure you use weather grommets to keep water out of the unit. If there is a speed reduction, that's negligible compared to the protection I've seen with this device!
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