Sharks and other bony fish have something called Ampulle of Lorenzini that let them detect electrical signals in the water. it can also detect electromagnetic signals and possibly temperature differences as well. I always thought it would be cool to be able to sense electromagnetic fields. It would probably be overwhelming though TBH
I hadn’t even considered the degree of finesse one could develop until you mentioned a router. Feeling a text vs a call, diagnosing an issue with an electric motor by proximity, instantly noticing loose wiring, feeling when malware begins spinning up processes, etc..