The electrical back box is designed to fit the count-down timer purchased from China with facia dimension about to UK standard and screws with metric standard. The electrical back box is designed with holes to fix onto the wall with nails or screws.

The back box also comes with 1 hole from each side to let the electric wires go in the box and out. There are 2 version of the back box. Version 2 is with slightly different width and depth to better fit the count-down timer purchased.