Last Friday, the tech giants announced that they were working on a system that will alert users by smartphone if they've been in contact with somebody infected with the coronavirus. The companies will embed Bluetooth-based technology into iPhones and Androids that will let smartphone owners know if they've been exposed to an infected individual in phases. Since then, the two have revealed further details about the system. In an interview with Forbes contributor David Phelan, for example, Apple and Google said every phone released since about fall 2015, or those iPhones compatible with iOS 13, will be able to use the system. The tech giants also added that the feature will not utilize too much battery.