NTC (Negative Temperature Coefficient) detection is primarily a temperature control mechanism that continuously monitors the air temperature of the hair dryer, preventing the air from becoming too hot and causing damage to the hair and scalp.
NTC thermistors are temperature sensors that decrease in resistance as temperature increases. By incorporating NTC sensors, the Xiaomi High-speed Ionic Hair Dryer can detect changes in ambient temperature at the air inlet. When the air temperature reaches a certain level, it stops heating further to maintain a constant temperature, preventing the air from becoming too hot and damaging the hair.