Remington Flexing Foil Shaver Remington F3790 Men's Flexing Foil Shaver Remington Flexing Foil Shaver with improved cutting system is now closer than ever! Dual Flexing Foil; Rechargeable Cordless Razor; 40 minute usage time; 16 hours charging time; Pop up trimmer; Masculine design; Surgical Steel Blades.