WHAT DOES CUSTOM AIR FRESHENER MEAN?

I purchased them for my husband & he truly enjoys them! It can be amongst his favored pics of me & the smell is great, we both of those adore it. Not too mind-boggling and its been over a week plus a half now & it still smells great. I will Totally make A further buy.I purchased dark ice for reference. He’s experienced it in his truck for 2 month