Wireless power transfer offers lots of conveniences to mobile device users. When your device is running out of battery, you can simply hook up to a remote power station wirelessly, which allows you not to be bound by tangling power cable.
Sony is currently working on wireless power transfer technology, which has achieved pretty promising result that can transfer up to 60 watt of electrical energy over half a meter distance. The efficiency falls around 80%, 60% with rectifier.
