Here is a breakdown of other rebrands of this device…
I only have the WADWAZ, but am pretty sure that none of the zwave plus ones have the external switch.
Anywhere you can hook up a microswitch or relay! Leak sensors, water level sensor (water softener salt reminder), doorbell, anything you can think of with a Arduino device (there are normally cheaper/better ways to do this, but my WADWAZ cost a couple bucks each and I have lots of spares!), Halloween sound effects, mouse traps, etc. I may do a post or blog some day with details. I’ll definitely post once I finalize the pressure mats. It is a very handy device for those moments when me or my wife go “hey, let’s make that smart”.