The quality of the product and all other key components (motor, rechargeable batteries, inductive charger) are shared by all three models.

Each person is unique, with a unique level of sensitivity. Even the same person can have different sensitivities and moods from day to day. The model differences are as follow:

Zumio S:
Zumio S is our least intense model. it features a wider, spherical tip and a short, flexible stem.  This distributes the stimulation over a wider area.
Zumio X:
Zumio X is more intense. Its spherical tip is smaller than the Model S and it has a longer, flexible stem. This creates a more pinpoint delivery of the rotation and therefore more intense stimulation.

Zumio E:Zumio E is currently our most intense – and most versatile – model. It features our smallest tip, which has a concave shape, and a curved, rigid stem. The curved stem creates an elliptical motion and the concave tip offers different contact areas, so the sensation will change depending o how you hold, twist, or angle the device. The combination results in precise and intense stimulation.