A:AnswerTwo things:
1. Yes you do need a compatible zwave hub which then links to personal assistants like the dots, echoes or google homes.
2. This is a ADD ON switch meaning this acts as a secondary or third switch in a 3 way wiring scenario. You would need to buy the regular switch in addition to this add on for 3 way installs. If only one switch is needed, you would need the regular switch (not this add on switch).