Flex Foil Technology: Foils are spaced apart so that the first foil trims hair closely, then gently stretches the skin so that the second foil can get even closer. Surgical Stainless Steel Blades: Shave quickly and cleanly with the sharp, long-lasting blades housed beneath two durable foils. Pop-Up Detail Trimmer: Trim your beard and side burns for a clean-cut look. Rechargeable: Cordless runtime of 30 minutes. Includes LED charge indicator.