More Powerful For Thick Long Nails with Grinding Wheels - Equipped a large capacity Ni-MH rechargeable battery, which has a larger discharge current, making the motor 5 times stronger than the old version, which makes it trim thick and long nails of big breed pets quickly and smoothly. (Note:Avoid overcharging and overdischarging of the battery.) Super Strong and Quiet Motor and 2 Speed - This Dog Nail Trimmer uses a brass bearing motor , comes with 2 Speed fast rotation (7500/9000 rpm).With the features of low vibration and low noise (less than 35 db), your pet will not afraid to trim nails Safe and Effective - Made of diamond emery ,our Dog Nail Grinder wheel can quickly and safely trim your pet's nails, safer and more effective than Dog Nail Clippers to reduce your pet's fear of clipping toenails and the risk of over cutting and hurting your pet. Three Size Ports - There are 3 size openings in the grinder area, you can use depending on your pet's nail size. The Small and medium openings are for small and medium sized pets. For larger pets, the entire cover can be removed to expose the entire bit to easily trim large nails. Rechargeable and Portable - The cordless dog grinder is rechargeable and has an indicator light on the bottom that turns on when charging. Each grinder has a built-in battery that lasts 6 hours after a 4 hours charge. The lightweight and ergonomic body design also makes it easier to handle in your right or left hand.