Rezence (pronounced reh-zense) was an interface standard developed by the WiPower (A4WP) for wireless electrical power transfer based on the principles of magnetic resonance.

The Rezence system consisted of a single power transmitter unit (PTU) and one or more power receiver units (PRUs).

The interface standard supported power transfer up to 50 watts,[1] at distances up to 5 centimeters.

A Bluetooth Low Energy link was defined in the A4WP system intended for control of power levels, identification of valid loads and protection of non-compliant devices.

Board member companies[5] included Broadcom, Gill Electronics, Integrated Device Technology (IDT),[6] Intel,[7][8] Qualcomm, Samsung Electronics,[9] Samsung Electro-Mechanics, and WiTricity.