[Note before: This plugin is listed as "No longer available" but it is in fact still available through the developer's website].
With this plugin you can add short chunks of beeps (either of the same tone or various -> "Variation" parameter), white noise or muted breaks to your audio.
The beeps do what they should, but don't sound very pleasant. White noise comes in and goes out abruptly.
I think the most useful mode of this device is just using muted breaks, of which you can even set the volume of with the "Gain" parameter.
1. The protecting noises only can stay for a maximum of 1,5 second and work dependent upon a regular interval in time. There is no option you can create a long and persisting protector noise.
2. The sound chunks of 1,5 sec come in with no fade-in or fade-out, which can really be annoying to listen to. Especially when you want that your protector sounds are noticable loud. Here a fade-in and fade-out could have build a way easier and pleasant transition.
This plugin belongs to a niche of plugins and is even in the niche a very unique thing. I don't want to disregard it to much, so I still give 4 stars, but I doubt it can be really helpful even for its own purpose.