This document introduces the usage and features of a dehumidifier. The dehumidifier has multiple operating modes including auto mode, weak dehumidification, strong dehumidification, and air purification, which are suitable for different environmental needs. The dehumidifier also has a memory function that can automatically resume the previous operating mode when turned on again. Additionally, the dehumidifier is equipped with plasma function for sterilization, air purification, and odor elimination.