Both color options are included.
Yes, it does work with Echo
Yes. You can use a smart switch connected to wifi or through a hub and use the leviton app or the associated app for the hub to set a schedule for turning lights on and off.
There could be a compatibility issue with the fixture. Make sure you're using an appropriate dimmer type for your lighting as not all lighting (LEDs in particular) will work with the same dimmer.
No, you need to a "remote" switch from this brand. The remote is wired differently from a traditional 3-way. It requires a hot, neutral, and coms wire. You can use the old "traveler" wires to supply the hot and coms wire.
You can buy these at Home Depot now.
Yes. I have these witches installed in both 3 way and 4 way applications. Just be sure to use the matching remote switch for the other locations.
This is a Z-Wave dimmer, however, it utilizes Line voltage dimming.
There’s no limit to the number of receptacles only the 600 W total load. With modern 15 W LEDs you can get 40 lights on one switch
Yes, it works with Alexa through the z-wave hub. Not certain what you about timer but the sumsung Smartthings hub has various timing on and off delay that you can use.