AirPower: The Best Gadget Apple Never Made

Apple finally killed off its promised wireless charger, which was meant to simultaneously power up an iPhone, Apple Watch and AirPods. With the help of Play Doh, WSJ's Joanna Stern explains the technical hurdles to multi-device wireless charging, then recommends some OK-but-not-great alternatives. Photo: Rob Alcaraz/The Wall Street Journal.

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