Product features:

North American tractor units have a 12Volt electrical system, when they connect to a European trailer it has a 24Volt system.

The DAB power converter means you can couple to 24V trailers and have full ABS/EBS functionality, plus no changing bulbs. The system contains its own batteries so if you park the vehicle for short periods side lights or Hazard lights still work, then once the engine is running they recharge from the powerful 12-24 inverter.