If the condenser microphone is stored in a hot and humid place, it may cause deterioration of sound quality and noise. It is not always necessary to have a desiccator (dehumidifier), but if you have multiple condenser microphones, it is convenient to have a small desiccator. Normally, there is no problem just putting the dehumidifying agent in the box at the time of purchase or a box with a high degree of airtightness.