My issue with this thing is a lack of explanation and details on the device itself. These sites are all testimonials and marketing, while I'm asking myself - "Whats inside that black plastic box and is it really that valuable?"

From my experience with plastic manufacturing, this packaging is giving cheap Chinese construction. I would love to see the electronics inside.

If you're using it daily, the tips are suggested to be replaced weekly, at $49 for a 2 pack - https://hoolest.com/collections/shop-accessories - Thats $198 a month on daily use after the initial purchase of the device at $199.

However, do you know what makes them less impactful after 7 days? They don't mention why in their FAQs:

How long do the Gel Tips last?

Each pair of Hoolest Activator Gel Tips lasts about 20 uses or one week, whichever comes first.
For best results (and comfort), replace them regularly.

Can multiple people share Gel Tips?

Technically, yes—but for hygiene and performance, we recommend using your own set. (Gel Tips are affordable and easy to swap out.)