If a device maker doesn't integrate the infrared receiver directly into the smartphone or wireless speaker or keyboard, it could also easily attach to it through a case or other dongle. Unlike coils that emit radiation for induction or magnetic resonance types of wireless charging (Qi and , respectively), this method precisely beams light just to the receiver using a laser diode in the transmitter and a photovoltaic cell in the receiver to reconvert the light energy into electric energy.
Wi-Charge will presumably have worked out performance lag by then.
IR, or infrared, communication is a common, inexpensive, and easy to use wireless communication technology.
IR light is very similar to visible light, except that it has a slightlty longer wavelength.
The company envisions transmitters fitted into light fixtures and smoke detectors that beam infrared light to automatically top up devices within a room -- say, a coffee shop or your home, or even an airport waiting lounge.
Wi-Charge's system makes use of a ceiling-mounted transmitter to convert energy into infrared light, beam that light across an approximately 500-foot area and capture it in a receiver on or inside the electronic device, where it converts from light into energy once again.