Israeli researchers say they have invented a reusable face mask that can kill the coronavirus with heat by drawing power from a mobile phone charger.

The disinfecting process takes about 30 minutes – and users should not wear the mask while it is plugged in, said Professor Yair Ein-Eli, who led the research team at Technion University in Haifa.

The new mask has a USB port that connects to a power source such as a standard cellphone charger that heats an inner layer of carbon fibers to up to 70 degrees Celsius (158 degrees Fahrenheit), high enough to kill viruses.