The towbar manufacturer’s guarantee will apply: in most instances this would cover all mechanical and wear items for the life of the vehicle.
This would of course be subject to conditions, i.e. relating to the maximum specified loading of the towbar, and the towbar may not be modified or transferred to another vehicle. In addition, your Mobile Towbar fitment team will double check critical safety aspects on each towbar before it is fitted.
In addition to the manufacturer being ultimately responsible for any failures on the total part, the company manufacturing the electronics covers all field failures. It has to be said that virtually all failures (of which there are very few) are detected at the fitment stage as the application would just not work on the vehicle.
*As an additional safety feature the electronics are, after fitment, tested with a GSM enabled test module which checks the working of the electronics on the vehicle and remotely sends a report via a GSM link to the manufacturers interface. Your module is in the process also registered with the manufacturer.