Advanced 2-Speed Switch Adjustable low-high speed design is powerful enough support heavy grinding.Reducing the risk of clipping the claws too short or hurt the pets quick. Low Noise Grinder < 50 db The pet nail grinder has 3 ports for different sized nails.And it is low on noise and vibrations,will not scare your dogs. USB Rechargeable & Portable The cordless, comfort fit pet grinder built-in battery that lasts 2 hours after a 3-hour charge.Power adapter is not included, please plug into phone adapter / power bank / laptop. How to Use The Nail Grinder Correctly? Step 1: Accustom your dog to the sound of the grinder Turn on the grinder and accustom your dog to the sound and smell, to avoid scaring dogs at the first time use. Step2: Choose the appropriately port Make sure dog is ready then choose the appropriately sized port. Carefully place the grinder onto the nail. Please use low-speed to start when using the grinder. Step3: Reward your dog every single time Always include a favorite treat during the session and at the end to let dog associates the product with a pleasant reward. Step 4: Clean the grinding wheel After grinding,gently clean the surface of the nail grinder with wet paper or cloth to remove the nail powder, to keep the grinding wheel sharp.