Leading dermatologists and Olay skin scientists have partnered to establish the Olay Professional Alliance. Through this partnership, Pro-X was created to bring you prescribed regimens to treat your specific skin care concerns. Cleanses skin 6x better and helps maximize the immediate hydrating effectiveness of your anti-aging moisturizer. vs. basic cleansing. Professionally Designed With The Following Features : 2-speed, rotating system delivers daily deep cleansing and gentle exfoliation. Water resistant for use in the shower. Replaceable soft bristle brush head. Refills available. Pro-X Exfoliating Renewal Cleanser recommended for daily exfoliation. Cleansing brush can also be used with a broad range of Olay cleansers for daily deep cleansing. 2 AA batteries also included.