The Optiheat technology ensures a consistent temperature during styling and guarantees long-lasting results. When the styling plates are opened, their temperature naturally drops. If the preset temperature of the Proluxe Midnight Edition Hair Straightener S9100B is not maintained, the integrated sensor adjusts it. This allows for the roots, where more heat is needed, to be styled at a higher temperature, achieving optimal styling results. A particularly gentle styling experience is provided by the "Pro +" setting, which heats the straightener to a hair-friendly temperature of 185 °C. The narrow, 110 mm wide, and spring-loaded styling plates feature an Ultimate-Glide ceramic coating that evenly distributes pressure on the hair. The integrated digital display allows for 9 variable temperature settings ranging from 150-230 °C. After just 10 seconds of heating time, the straightener is ready for use.