... chemical agents can not achieve3. Effective prevention of air-conditioning diseases: negative ions may improve metabolism. ... It maintains a fresh air, relieves fatigue and effectively prevents the diseases ... OriginGuangdong, China (Mainland)Brand NameOEMModel NumberZY-LS032ProductSolar Air Cleaner PurifierMaterialABSColorBlack, silverSize19*12cm/16*4.5cmPackagingColor boxCtn ...