Scientists develop first battery-free phone

A group of scientists from the University of Washington (UW) has created the first ever mobile phone that doesn't need a battery to power itself when making or receiving phone calls.

The main catch behind this creation is that the phone draws power from ambient radio signals and sunlight to power the circuitry needed to make or receive calls.

Currently, the device is just a phone, and you don't have a screen and anything else you can find in modern smartphones. It only needs 3.5 microwatts of power

They succeeded by creating a system that only needs 3.5 microwatts of power to make or receive calls. Researchers plan to fix the phone's biggest drawback, which is a button that users need to press to switch between sending and receiving mode. sers to press a button to switch between these two modes.