Works best with these Braun Series 5 Shavers: 5118s, 5120s and 5150cs; it is compatible with all Braun Series 5, 6, and 7 flex new generation shavers Replace the head after 18 months to get a shave as efficient as day one with your existing cordless shaver Foil shaver with an EasyClick system lets you easily click the new head into place Wet and dry shaving functionality ensures that you can use the trimmer with or without water Features waterproof floating and pivoting heads with three blades, ensuring even results each time you use it