These days one of the world’s biggest problem is air pollution. 'Let-In -Clear' is a new type of air purifier designed to solve the fear of ventilation and letting in the air outside to inside of people’s house without any worrisome. 1. Purifying air coming through the window : Additional space does not need for the air care device. 2. New interaction : New way of interaction with the transparent display. Useful information related to air quality is shown in real time. 3. Charging Objet Stand : When user want to use it inside, then it can be put on this objet stand. At the same time, the objet stand charges battery. Fine dust? Now, don't worry. 100% fresh air in your home, blowing through small opening of window.