Mercedes-Benz has developed a technology called PRE-SAFE Sound, which is designed to reduce the impact of loud noises on hearing during a car crash. The system works by emitting a 'pink noise' signal through the car's sound system, triggering a reflex that helps protect the eardrum. This technology is currently available in some Mercedes-Benz E-Class models. The goal of PRE-SAFE Sound is to mitigate hearing damage caused by high acoustic pressure or loud noises during a crash.