![]() Most of the units we’ve tested split this current over two ports, which means that if you plug in two devices, they’ll each charge at less than half their maximum speed. ![]() We prefer that each port be rated for at least 2.4 amps-which is what most phones and tablets require to charge at full speed-but such ports are relatively rare. USB charging: Since many devices and accessories charge via USB, we limit our search to power strips with USB ports, which helps reduce the number of wall warts you have to pack. Reviews Netflix’s relentless Western The Power of the Dog is 2021’s best movie so far Director Jane Campion and Benedict Cumberbatch bring complex emotions to the West By Robert Daniels.We call out models that can serve as true surge protectors, but if that’s your main concern, you need to invest in a larger option. Most portable models, though, let through more than 1,000 volts. In other testing, we’ve found that many electronics can survive a 400-volt hit-the amount that most home surge protectors let through when struck by a 5,000-volt surge. What really matters is how much voltage from a surge makes it through the outlets. The joule rating on the box gives you some indication of how long a model will take cumulative surges, but not how much power could hit the gear you have plugged in. ![]()
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