Question about vibration and Bathmate Hydro Vibe

Hello, I am using the Bathmate Hydro Vibe bullets to test for 15 minutes if I have any results using extender. The problem is that I don’t have the slightest idea about the RPM of the bullets, and I don’t see anything on the website. Could someone who may have experimented with meters, what is the max RPM? I don’t know if it’s a little, or a lot, I don’t have any previous reference. But the ligaments do fall asleep (I use the most powerful option)

Thanks