Sumicas is an indoor environment improvement system that combines a charcoal paint called Health Protect with a SUMICAS (Sumicas) voltage device. It is a new system that creates a negative ion space with the power of charcoal and electronics to improve the indoor environment. By introducing Sumicas, you can obtain five effects based on evidence (scientific evidence) from university institutions, etc. ・Adsorption and decomposition of odors and chemical substances ・Activation of immune cells ・Improved learning ability ・Shielding electromagnetic waves ・Making pets (dogs) healthy It has acquired domestic and international patents, and although there are air purifiers that generate negative ions, only ARTECH's Sumicas can adsorb positive ions. This product is effective when the charcoal paint Health Protect is applied to the walls, so it is suitable for new construction and renovation. There are minor scratches and scuffs, but overall, it is in a condition with little signs of use. The box and instruction manual are in poor condition, so please consider them as extras. Sick house, asthma, rhinitis, virus countermeasures, improved immunity NK (natural killer) cell activation, health, good sleep