All of this information is presented in the user guide/datasheet for the device, which can be found on the downloads tab of the product listing.
However if you are using a mobile phone or tablet to view our website it may not be visible.
To this end I have copied in a link to the electronic version of the instructions as well as a brief summary of the requested information below for your convenience.
43.73 mm wide
28.73 mm deep
16.00 mm high
You need to bear in mind that the mounting pegs will also intrude into these dimension but the provided data sheet also includes an illustration of the maximum board size/shape that the box will accommodate (bottom right diagram)
Date published: 2016-05-20