Wireless Communication's Crystal Ball (image) Fraunhofer-Gesellschaft Caption "Awair" displays when signals are being transmitted and on which frequencies. Credit © Fraunhofer ESK Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.