What are the components of the Smart Thermostat HD (ADC-T40K-HD)?

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Three components make up the Smart Thermostat HD:

Trim plate
Thermostat (ADC-T40)
Display (ADC-T40-HD)

The Thermostat will mount on the wall using the trim plate, with wires inserted in the terminals, and the Display will mount onto the Thermostat using magnets.

Note: The Display is the component containing the Temperature and Humidity sensor for the Thermostat, not the Thermostat.

The Thermostat is the component that communicates with the Z-Wave network, not the Display.

Naming conventions

Model/part numbers

ADC-T40K-HD	The product as a whole. When ordering the ADC-T40K-HD, it will come with an ADC-T40 and an ADC-T40-HD in the box, along with instructions for installing the Smart Thermostat HD in the traditional configuration.
ADC-T40	The base thermostat (see Thermostat below).
ADC-T40-HD	The touchscreen display (see Display below).

Common language

Smart Thermostat HD	The Smart Thermostat HD encompasses either both the Thermostat + Display. This is what the end user will think the product is. To them, the product is the Smart Thermostat HD.
Thermostat	The section of the Smart Thermostat HD that has the traditional thermostat capabilities - relays, terminals, HVAC control logic, and is technically a fully functional headless (no display) thermostat. Users may think the is just the backplate, as it is mounted to the wall and has the wire terminals. The Thermostat is the portion of the product that communicates over Z-Wave to the Z-Wave controller.
Display	The touchscreen display section of the Smart Thermostat HD. This is the part the user will view and interact with. It connects to the front of the Thermostat and is powered via the Thermostat. It cannot be used standalone. It has all the environmental sensors for the Smart Thermostat HD and relays the information to the Thermostat for use. It does not communicate with the Z-Wave controller directly, as all communication with the Z-Wave controller is relayed through the Thermostat.

Smart Thermostat HD

The Smart Thermostat HD encompasses either both the Thermostat + Display.

This is what the end user will think the product is. To them, the product is the Smart Thermostat HD.

Thermostat

The section of the Smart Thermostat HD that has the traditional thermostat capabilities - relays, terminals, HVAC control logic, and is technically a fully functional headless (no display) thermostat.

Users may think the is just the backplate, as it is mounted to the wall and has the wire terminals.

The Thermostat is the portion of the product that communicates over Z-Wave to the Z-Wave controller.

Display

The touchscreen display section of the Smart Thermostat HD. This is the part the user will view and interact with.

It connects to the front of the Thermostat and is powered via the Thermostat. It cannot be used standalone.

It has all the environmental sensors for the Smart Thermostat HD and relays the information to the Thermostat for use. It does not communicate with the Z-Wave controller directly, as all communication with the Z-Wave controller is relayed through the Thermostat.