Metal double foil shaver with universal, replaceable battery. Improved N1 high-performance digital motor with high torque and double ball bearing for more efficiency. It delivers a speed of 10,000 rpm. Device warranty 2 years.Precision-manufactured titanium foils: Two counter-rotating cutting blades.Offset double foil system.Swivel foil head with locking function.The new FXONE system is a revolutionary single-battery system. The high-performance lithium-ion batteries can be charged independently of each other. While one battery is charging, the other battery can be used. For sustained high cutting performance with unlimited runtime.