Review on 💻 Tupavco TP302 Ethernet Surge Protector (2 Pack) with PoE+ Gigabit and Gas Discharge Tube for Full Protection - RJ45 Lightning Suppressor - Mounting Flange - Ideal for LAN Network CAT5/CAT6 - Thunder Arrestor - GbE 1000 Mbps. by Jerry Estrada

Construction is good. I ground them to the ground rail with the green/yellow ground wire; It looks like they could also be screwed to a grounded surface. Of course, the only way to know if they really work is to destroy them with a lightning bolt (or use expensive test equipment). Not me! I didn't even open it to see what's inside. I was asked to rate their "journey" quality. I'm not sure why. In any case, they are not suitable for travel, as they have to be screwed to the floor. They are ineffective if used without grounding.