The case for dog nail clippers upgraded the battery and increased the battery life from 3 hours to 10 hours. Once fully charged, the pet nail grinder will be well-performed over ten hours in continuous work. More convenient step-less speed regulation switch (4,500-11,000 r/min) which is quicker and more choices than any other products. The top of this pet nails grinder has a diamond-bit grinder, open when it in High-speed use it to smooth nails not splits, reducing the risk of clipping the claws CASIFOR PET NAIL GRINDER: STEP 1: Let your pet get used to the grinder, which may ease them during use - let them listen to its working sound, getting accustomed to it, and then grind the pet's nails a little 'good thing'...and if the dog tries to pull his paw away from you, or struggles to get free, give him the No, stay! Command and praise him immediately when he follows your command!!..