Wahl 2-in1 EZ Nail Clipper & Filer unit combines a nail clipper and a filer! It is a must have for groomers whether they are professional or home users. The clipper itself features a safety guide to ensure that the nails are not cut too short and the filer, located in the handle runs on a single AA battery. Its a very easy to use model and runs quietly to ease even the most nervous of pets getting their nails groomed. The pack is complete with a spare filer wheel along with an AA battery.