Installation uses original vehicle connectors and a multifunctional trailer module which amplify all necessary signals. Compatible with both conventional bulb and LED trailer lights and featuring audible warning of trailer turn indicator or brake light malfunction. The rear fog lamp of the vehicle is automatically switched off when a trailer is connected.

Available with a 7-pole socket with drainage holes to prevent accumulation of water.

Adapter is available to temporarily change 7-pole to 13-pole.
7-pole (vehicle) to 13-pole (trailer/ caravan) adapter: 55622ADB00

Reference picture.