What it does not do is it does not use GPS or location to track people. So the system actually uses something different called Bluetooth Low Energy, which is privacy-preserving, it doesn't drain the battery and it makes it more also interoperable between both Apple and the Android system so it's more useful, not only in the US context, but globally.
Lo que no hace es usar GPS o localizador para rastrear a la gente, sino que el sistema usa algo diferente llamado Bluetooth de baja energía, que respeta la privacidad, no agota la batería y tiene mayor interoperatividad tanto con Apple como con Android, de modo que resulta más útil no solo en EE. UU. sino a nivel mundial.