The intensities are automatically set in each Vibe. For example, if you want to use the Apollo Neuro for sleep, it defaults to a 40% intensity. If you want to use it for more focus, it defaults to a 15% intensity. That being said, the right intensity depends on where you wear it. The vibration is more intense on larger bones, like your chest or spine, so if you wear it in these areas, you’ll want to start with a lower intensity than the wrist or ankle. Ultimately, you should set the intensity so it isn’t distracting, but rather just barely perceptible. It’s normal to forget you’re wearing it as the vibrations fade into the background.