4-Blade Ultra-Thin Foil Cutting System with 30 Degree "Nano Blades" for a clean shaving experience
13,000 CPM Linear Motor Drive with a Flexible Pivoting Head with Stainless Steel Foil and Blade, Built-in Pop-up Trimmer
10-Stage LCD readout, Lock Button, Sonic Vibration Cleaning Mode for quick clean-up
Use Wet with Shaving Gel or Dry, 100% Waterproof, Includes Travel pouch and AC Adapter
It is recommended that you replace the outer foil and inner blade at least every year to maintain the cutting edge on your razor
The replacement inner blade and outer foil is $37. This uses one 14500-size Lithium rechargeable, with some welded-on lugs on both ends. Replacement aftermarket battery is about $25. Prices are high enough that I prefer to just use these and buy a whole new unit when they drop in price.
If you want to go lower, EBay has an open-box retail listing for about $52.