USB charging ports make it not only a travel adapter, but also a USB power plug charger for multiple devices charging, convenient and multifunctional. There’s an auto-resetting fuse to protect your gadgets from power surges, and the Passport III has a 10-amp limit. Use of this site constitutes acceptance of our User Agreement and Privacy Policy and Cookie Statement and Your California Privacy Rights.

The choice between universal travel adapters and individual plug adapters ultimately comes down to personal preference. Room temperature is necessary for keeping the universal travel adapter work normally and efficiently. Our universal-adapter picks, as well as the other Ceptics set we discuss below, have a larger “face” for your charger to brace against—more like that of a traditional outlet—so there’s less chance of gravity having its way with your gear. Also, these are necessary if you’re traveling to a country that has outlets incompatible with any of the four types included in a universal adapter (which, as that sentence reveals, aren’t actually universal).The house she stayed in had outlets unlike anything on Wikipedia’s chart, and the plug adapters she’d used elsewhere in Reykjavik didn’t fit at all.

The Ceptics Plug Adapter set combines everything we were looking for in plug adapters: small size, solid build quality, and—well, small size is really the thing here. Last, I checked how bright the LED on each was, since a too-bright LED keeping me awake has been a pet peeve of mine for years. Bonaker: Formerly our runner-up pick, this travel adapter had the usual mix of four plug types to cover you in most countries, but its four USB-A ports were slower than our top pick’s, and it had no USB-C port at all. Note that it doesn't convert voltage, so verify your devices' compatibility within the 100V-250V range before use, particularly for appliances like hair dryers or irons.

All had a US-style plug, so I tested each one in several outlets around my house—some new, some old. The adapters are flimsy, there’s no grounding, and the European plug's design doesn’t work well with the recessed sockets you will sometimes encounter. It’s worth noting again for clarity, USB is USB, so if you’re just plugging in a USB cable, unless something is horribly wrong, one USB port’s voltage is the same as any other USB port’s voltage. Despite feeling a little cheaper than the iBlockCube, the Travel Plug does its job and does it well, plus it’s safe and compact for some peace of mind if you’re charging your phone overnight!