The linear WA00Z1 smart light switch cover has now been released under several different brand names, including gocontrol and Domitech.
This is a battery operated Z wave device which fits over the top of an existing light switch. The idea is that you leave the original light switch in place powered on to provide power to smart bulbs, and then you can use the smart switch cover, which has two buttons, to provide an intuitive light switch that can turn The bulbs on and off. Looks like most free shipping retailers have it for about $40 - $45.
Out of the box, it can be used with Z wave association. But it is also intended to be able to be used as a “button controller” where the commands are sent back to the hub. This should allow it to be used via the ST hub to control zigbee light bulbs or several other options. Fortunately, @ajpri Has created a device handler to allow it to be used as a button controller which opens up many more options.
The form factor is similar to the Osram Lightify Zigbee switch.
A couple of things to note:
One) because this is battery operated, it will not be able to work as a zwave repeater
this device does not control the load on the circuit. So it can only be used with devices that communicate independently with the hub. So smart bulbs rather then a fixture with dumb bulbs.
so far, this has only been zwave-certified for the US region. So it will only work with the US hub, not the UK hub
Product details including conformance statement and manual:
And AJustinhas now (April 11, 2016) released his button controller device handler for it.
The aesthetics aren’t perfect, but it’s very intuitive for guests and works well. It can also fit next to another light switch in a two gang space.
Because this is a button controller, you could have the top button turn on a virtual toggle so that it was both on and off for one purpose, and the same thing for the bottom button. Unless you label each of those (e.g. “Basement” by button 1 and “kitchen” by button 2), though, I don’t think that setup’s going to be intuitive for guests.