Vito,
Yes, it does not only require the Almond+, but they require what's called a minmote to do the association. Really nice switches, primarily because they work with LED bulbs. However, to require a third party device to get the two switches to work together as a 3-way is a huge negative. Besides, the Almond+ does not support groups so it is neither here nor there. I ordered the GE version, which uses a traveler wire. The downside is that the GE dimmer switches don't work with anything other than incandescent bulbs.