The phone, which does not need a battery for transmitting messages and calls, was created by engineers at the University of Washington in Seattle. The developers attempted to create such a device earlier, but they were faced with insufficient amount of energy received from solar batteries and other sources.

Now they were able to solve the problem. Almost…

The basis of the phone is a microwave cavity that operates without batteries and is able to transmit the vibrations created by the human voice to the nearby receiver.

Some components of the cellular, for example, the station responsible for contact with the network, had to be placed next to the phone to save energy. Since the phone receives signals from it, and then converts them into electricity, the station can not yet be removed far. In the future, developers plan to integrate the station into a Wi-Fi router installed on the telephone tower, and increase the distance.

Now the prototype has the usual buttons and a tiny screen – for the sake of saving energy it is necessary to save everything, and the quality of communication leaves much to be desired. In the nearest future, developers will fix the situation and then equip the handset with an E-ink display, which will allow sending full text messages from the phone and tracking various information. Then, if everything is normal with power, the phone will be supplied with a camera.