Warm reminder: without battery, please purchase according to your needs Product name: pet nail polisher Model: M1 Grinding wheel type: Interchangeable grinding wheel Charging time: 1.5 hours Applicable pets: dogs, cats Charging method: USB charging Shell material: ABS environmental protection material Power: 2W Voltage range: 5V How to Use The Pet Nail Grinder? 1. Let Your Pet Get Used To The Grinder Before grinding, show your pets the nail grinder and let pets get used to the rotating sounds in order to avoid fears. To avoid scaring dogs at the first time use. 2. 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.