THREE COLOR FLASH LED HAND SHOWER  Washable & reusable  Lasts 1-3 years  Refillable Alkaline calcium: -Help to purify and filter the water by removing residual chlorine. Far infrared ray: -Helps to purify water by releasing Vit C, Zinc, Lithium, Iodine and Selenium and are bacteriostatic. Weak acid beauty: -adds vitamin C and creates a mild soft spa feel to simulate perspiration and metabolism.