At least eight AC outlets for living room or office use: We required at least eight AC outlets for the main, runner-up, and top-of-the-line contenders, at least four for the nightstand contenders, and one to four for our light-duty pick.

Otherwise, we required, at minimum, an indicator light that will notify you when items plugged into the unit are no longer protected against surges.

Automatic shutoff when the surge protector wears out: We preferred that the surge protector have an auto-shutoff feature so that it never leaves your equipment inadvertently unprotected.

We’d choose the SK30USB for protecting a few small household appliances-say, an essential oil diffuser, a Nintendo Switch dock, and a coffee grinder-and a couple of smartphones, or even for tossing in a carry-on when we’re traveling. In contrast to many comparable models, its compact size, grounded (three-prong) plug, and optional screw in the center of the unit help keep it firmly attached to the wall outlet, which is important for preventing electrical fires or shocks. It performs well compared with other small options we’ve tested, blocking almost as many volts as larger models. In addition to the three AC outlets, it comes equipped with two USB ports that offer a combined 2.1 amps to charge a phone, a tablet, or a couple of low-power devices. It has an auto-shutoff mechanism, making it one of the few three-outlet options we’ve found that will disconnect the power when the surge protection wears out. The Tripp Lite Protect It 3-Outlet Surge Protector SK30USB offers the portability of our favorite small power strips for travel but with even more protection.

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