There are variety of Crowtail sensor modules that is available at Elecrow now. you can use them to build you smart home project easily. With Standard connector that makes it easy to connect. And there are some Crowtail modules that are really useful. Such as Crowtail- Extend Board for Connection . it will solve your big trouble when you want to set up a remote connection with Arduino and Sensors.
You can visit this blog for more detail description about the Crowtail products.