Handheld Rechargeable Chainsaw Sharpener, 9.6V, 10 Speeds, 3 Grinding Stones Handheld Rechargeable Chainsaw Sharpener - Works on any chainsaw brand Operates on (2) 9.6 volt batteries (batteries are rechargeable) Comes with charger base, AC/DC adapter with 3 hour charger LED work light on the tip, 10 variable speeds, and runs at 8,000 to 20,000 rpm's Comes with 3 grinding stones: 5/32 inch, 3/16 inch, and 7/32 inch