Wireless Chargers

The Qi mark is licensed by the Wireless Power Consortium, not a description a factory may apply to itself, and the gap between a certified transmitter and an uncertified one that behaves like it is the most common defect in this category. It matters commercially as well as legally: a phone that cannot authenticate a transmitter falls back to a slower profile, so an uncertified fifteen-watt pad often charges at five and the buyer blames the phone. Read the output figure as power delivered to the device rather than drawn from the wall, because induction loses a meaningful share of it as heat. Foreign object detection is the safety function to confirm by test rather than by datasheet — a coin or a key left on a pad is the failure mode that produces a burn. The wireless standard and the rated output are published here as fields rather than prose.