Does it work with Amazon Echo (Alexa)?

Not directly but Samsung’s SmartThings does and fibaro works with the SmartThings hub, I have this rugged up myself, and works great!

whats the difference between this dimmer 2 from fibaro and the previous version? What depth of back box do you need for this to fit in there?

Main differences: Reduction in max. load to 250 W, automatic detection of the type of light load, supports both leading and trailing edge dimming (depending on load type), 500 series chipset, monitoring of power consumption, built-in Z-Wave network range indicator LED. So much improved, but with the penalty of the load reduction. Max height is 20.3 mm. This can be fitted in a 35 mm back box, with care and practice. Sorry none of this information is on the listing, but there is not much marketplace sellers can do--Amazon has tried to "improve" the product page.

I have some lights that are controlled by two switches, will this one work? do I need two of it or one is enough?

It can under the correct conditions. I just fitted one in the ceiling rose of a two way controlled light. I made the hole that the wires go through slightly bigger and slipped the 223 unit through the hole into the space above. The rose still covers the hole. Electrically the light fitting has no knowledge that there are two switches controlling it. The 223 contains two switches only S1 is needed in this case. If your case is similar then it should work fine.

What is the z save frequency?

The box with this product for Uk states 868MHz (I believe the actual European specification for Z-Wave Plus is 868.42MHz. Beware, it is different in North America, so devices are not compatible. I use this with a Samsung SmartThing hub

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💡 Elevate your lighting game with smart dimming that’s as savvy as you are.

SMART POWER INSIGHTS - Track your energy usage with integrated power metering to optimize efficiency.
EXTENDED SMART HOME REACH - Boost your Z-Wave network with built-in range extender capabilities.
SEAMLESS LED COMPATIBILITY - Effortlessly dim any LED lamp up to 250W for perfect ambiance.
UNIVERSAL CONTROLLER SUPPORT - Works flawlessly with any Z-Wave or Z-Wave+ controller for ultimate flexibility.
ULTRA LOW STANDBY CONSUMPTION - Consumes less than 0.8W, saving energy even when idle.

The Fibaro Dimmer 2 is a compact, 250W universal dimming module designed for LED and other dimmable lights. It features built-in power metering, acts as a Z-Wave range extender, and supports any Z-Wave or Z-Wave+ controller, all while maintaining ultra-low power consumption under 0.8W.

$2047

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The delivery time was excellent, and the packaging was secure.

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Manufacturer	FIBARO
Part Number	FGD-212
Product Dimensions	4 x 2 x 4.5 cm; 28.2 g
Batteries	1 Lithium Ion batteries required.
Item model number	Dimmer
Colour	No Color
Style	Dimmer 2
Finish	Satin
Pattern	Single
Power Source	AC
Voltage	3.6 Volts
Wattage	250 watts
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Switch Type	Dimmer
Usage	Usage personnel et commercial
Included Components	Dimmer 2, User Manual
Batteries included?	No
Batteries Required?	No
Item Weight	28.2 g

Fibaro Dimmer 2 Z-Wave Plus Universal Dimming Module for Lighting, 250 W, 3.6 V, Black

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