MrOracle | 306 opinions shared on Technology & Internet topic.
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You have to have a USB charger (the actual transformer) - those keychains are really just a short USB cable (USB A to Lightning, in the case of an iPhone cable - they also make USB A to Micro B or USB A to USB C).
Obviously, you could plug the cable into almost any USB A port and get SOME power, but a normal USB A port only gives 0.5 amps of 5V power, while a higher-end charger can provide 2.4 amps of 5V power, and for non-iPhones, can provide even more current at higher voltages, so a dedicated charger will charge the phone much faster than most random USB ports.
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