What's the benefit in the z-wave module? Nikeman are you having any wifi problems? You could extend your antenna on your router if signal is a issue. Also there maybe some settings in your router that may help in connection issues.
It allows you to connect and control from a central control module or app, if you do not want the radio that comes with it. Basically if you had a computer running a whole house control software, you could do lights, thermostat, alarms, etc. from that "Hal" type system.
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