This document@ Parts 1 and 2: Interface Definitions@ defines the interface between a Power Transmitter and a Power Receiver@ i.e. Power Class 0 Base Stations and Mobile Devices. Power Class 0 is the WPC designation for flat-surface devices@ such as chargers@ mobile phones@ tablets@ cameras@ and battery packs@ in the Baseline Power Profile (??5 W) and Extended Power Profile (??15 W). Current Specification structure (introduced in version 1.2.1) The Qi Wireless Power Transfer System for Power Class 0 Specification consists of the following documents.