or USB-powered sensors can also run off your router's power. This means you can keep essential devices powered without having to hunt down an open outlet or resort to a tangle of cables.

You must add a sound card to one of the router’s USB ports, connect a speaker ... One way is to connect your routers with an ethernet cable and switch the old one to AP mode.

The classic serial null-modem cable was, among other things ... [Nick Sayer] needed just such a tool, but one that would work in a modern USB environment. Enter the isolated USB null-modem.