Which type of icon could represent "active/inactive"

I did the translation to English on relevant parts only

This is a table that informs a user about a Tag (Physical device) status, and now we are changing the "Last transmission" column for an "Activity/No Activity" column.

Due to our user feedback, we realized they did not use the Last transmission, and we are looking to communicate if the device is alive or not.

So for a quick test, we want to use an icon to represent "Activity/No Activity".

So far I have a few options (see below) but I am not convinced at all.