@Miraz The concept of a self-contained, bluetooth contract-tracing device is a cleaver idea, though. The Aus government is having trouble getting people to download their Covid app, mainly for concerns around privacy, but also requiring iPhone users to have their app running in the foreground to be effective (the app predates Apples + Google's "contact tracing" API).
Allowing people to get a device like this, that they can put in the wallets or on their keys, could help with that. Just need to get people to remember to charge it before they go out.