Yet another company, PowerBeam, demonstrated a technology that it says will be able to charge wireless speakers or a digital photo frame from 10 meters away, by pointing a laser at a solar cell.

Texas Instruments and Motorola also plan to bring wireless power products to market.

One issue for all the vendors will be agreeing to a standard that lets their products interoperate. Another will be convincing consumers that the technologies are safe and won't interfere with wireless networks. Vendors here all were adamant that there are no safety or interference issues.