WPC/PMA/A4WPA designation for trimode phone cases that supports three wireless charging protocols. WPC (Wireless Power Consortium) governs the Qi protocol. PMA (Power Matters Alliance) became AirFuel Inductive, and A4WP (Alliance for Wireless Power) developed the Rezence method, which evolved into AirFuel Resonant. See wireless charging, Qi wireless charging and AirFuel.
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