Feature:Electronic dog nail grinder will make the process of caring for your favorite pet's claws simple and effective.Three size ports for different size pet’s nails. Small and medium pets are suitable for small and medium-sized openings.Ultra-quiet motor with high quality brass shaft- low noise, low vibration. Let your pet have a great grooming experience.Universal USB charging port, more convenient to carry and use. 4 hours power supply with 2 hours charge .(Please Full charged before first use)How to use this dog nail grinder?First use, should give your pet a short time to adapt this grinder, let your pet smell and listen to the sound to avoid fear. For long nails, use the clipper to cut the long nail and the grinder to trim the nail, smooth the edges. Choose the suitable port for your pet. For large-sized pet and grinding fast, you can take out the cover, use the grinder side. Holding nail grinder with one of your hands, switch on the nail grinder. Holding the pet pads with the other hand, put pet's nail gently into a hole, and then begin to grind the pet nail.Warm Tips1.To reduce your pets' fear, please use the electric pet nail grinder yourself and show them if they have not used it before.2.Especially not force your pets otherwise they would be too scared to be groomed or trimmed ever again.3.Do not grinder one nail for too long in case heat build-up within the nail and paw.