The system installed is official and also sold aftermarket.
Its official name is Marderabwehrsystem, in english that means its a Marten Defense System.
Its a device for ridding your engine bay of these pesky gnawing critters.
Audi Part #: 8U0054650
Copy and pasted from an online translator.
Original Audi marten defense system, high voltage / ultrasound device with battery
effective protection of your vehicle against marten bite, protects vehicle and animal
completely battery-powered and without electrical connection to the vehicle
High voltage system according to the pasture fence principle
Sensor technology switches off the system immediately when the vehicle is moving;
when the vehicle is stationary, the device is switched on again
flashing indicator irritates the marten additionally
Slimline design with double-pole stainless steel contact plates
electric defense combined with ultrasonic defense with two high quality piezo walkers
easy construction
Electrical system independent, no connection to the vehicle electrical system
Ultrasonic tone frequency modulated, Freqnez 20-25 kHz
effective beam angle> 170 °
Sound pressure at least 110 dB
CAN data bus suitable
Dust and waterproof to IP 65
Power consumption: approx. 0.4 mA
Delivery incl. Batteries (button cells), running time approx. 12-18 months
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