PRODUCT DESCRIPTION Cleans up to 99.99% of hair with its DualFiltration system. The unique double filter prevents hair and dirt from clogging your shaving heads, ensuring your shaver always performs at its very best.. Instructions- 1. remove seal. 2. Press the release button to lift the lid and insert cartridge. 3. Lower lid. For optimal results. Clean your shaver in the SmartClean system after every use. BRAND STORY By Philips