REACTOR Tension standalone vs add-on

What is the difference between the REACTOR Tension Standalone and Add-On version?
Both versions use the same main unit and are fully interchangeable.
The difference lies in the power setup and included accessories:

Add-On Version:
Designed for users who already have a REACTOR Motion Control Box.
It includes a power and data cable that connects directly to the REACTOR Motion control box for operation.
Ideal for integration into existing REACTOR systems.

Standalone Version:
Includes an external power supply and an emergency hold switch.
It operates independently without requiring a Motion Control Box.
Best suited for users who need a self-contained unit or standalone setup.

Summary:
Functionally identical main units. The difference is only in power supply and integration method.