Rubber boot cover for coil input socket

[buckee]

I have been watching Kruzer video's and noticed that the search coil input socket in the video has a thick rubber boot covering the connector. Does this come with the detector or is it a add on accessory.

 

[Dr. Witty]

It comes standard with the Kruzer. It caught my eye immediately but then I became captivated by the carbon fiber lower shaft an the beauty it emanated.