EB series brake controllers have the option of an encapsulated trailer mount unit.
The EBTM is completely potted in silicone elastomer to ensure protection against vibration and the weather.
As the manual button is not needed, it has been removed and the EBTM requires an auxiliary 12 volt available at the trailer socket. You should ensure the 12 volt supply in the trailer is adequate to supply sufficient power for safe braking. Apart from this the unit operates as the standard EB does.
Confirm with local transport authorities regarding the usage for trailer mount electric trailer brake controllers in your state.