Can this be used without physical switches and only for control with via z-wave?

Yes, the device doesn't need a physical input (switch) and you can control is using Z-Wave commands only. Remember to check your local safety regulations to make sure an emergency physical wall control isn't required for the load you'd like to control with the Zooz device.

I need similar that can run from 12-18vdc power, so I can relay some aux devices that also run on 12-18vdc. Do they make it?

I haven't found 1 for 18vdc So I used it to turn a 110v ac in 18vdc out powersupply on and off I know it's involved but it what I did

Will these work on GFCI circuits? I have 2 outdoor lights that are on ground fault circuits and all of the zwave switches I have tried trip the gfci.

Yes, it can be installed on a circuit with a GFCI. I have this installed on an exterior circuit with GFCI and it works just fine.

Does it click when on/off? If yes, how loud?

Any relay will make a sound when clicked so you will hear it when it's switched on and off. It's not too loud, just like your average 15A relay.

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🔧 Upgrade Your Switch Game!

SMART BULB MODE - Control smart bulbs without cutting power, keeping your home stylish and functional.
RELIABLE SUPPORT - Enjoy peace of mind with US-based support and a 5-year warranty upon registration.
EASY INSTALLATION - Pigtail wires make setup a breeze, fitting into even the most crowded switch boxes.
SEAMLESS INTEGRATION - Transform your existing wall switch into a smart relay effortlessly.
VERSATILE COMPATIBILITY - Works with SmartThings, Hubitat, and Home Assistant for ultimate flexibility.

The Zooz 700 Series Z-Wave Long Range Smart Relay ZEN51 is a versatile device that allows you to add Z-Wave functionality to your existing wall switches. It supports 3-way setups, is easy to install, and is compatible with major smart home hubs. With features like Smart Bulb Mode and robust security, this relay is perfect for modernizing your home automation.

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