Scientists working on a power source through Wi-Fi radiation

Today, among all types of chargers, traditional wired solutions reign supremely, but the day is near when owners of mobile devices will not have to frantically search for an outlet to charge their device.
A team of scientists at the University of Massachusetts was able to create a power source that literally draws energy from the air. The original antenna of the device is capable of capturing electromagnetic energy and turning it into a constant electric current. Moreover, the source of electricity can be Bluetooth, LTE and Wi-Fi radiation.
At the moment, it was possible to get only a 40-microwatt power supply, which is not enough to charge modern smartphones, but at present, work is underway to increase the efficiency of the device.