Your satisfaction is our top priority！ We provide 100% lifetime warranty for each set of our dog nail grinder, there is no risk for purchasing. First: when the grinder is used for the first time, turn on the grinder to the low speed, put it in front of the pet to make the pet adapt to the sound and smell, and give the dog reward by food or action when the dog does not resist the grinder. Then transfer to the high speed and put it in front of the pet, if the dog's performance is normal, it proves that the dog has adapted to the grinder. Second: please start from low speed. Make sure the dog is in a comfortable position. Put the grinder on its nails carefully, and choose the right size port when using nail protection Third: Only a small amount of grinding at a time. Trim the nail bottom first, then trim from the nail tip to smooth. Every time you finish a step, reward your dog. Notice: The grinder kit includes a USB cable, but there is no adaptor to suit the voltage of different countries. Your mobile phone adapter / power bank / laptop can be easily charged. To avoid dog hair getting caught in the grinder, please take away the hair from the paws of the pet before using the grinder. Trim dog nails at right angles. Place the electric nail grinder at a 45-degree angle and move the grinder to trim the nails. Remember, you can only connect the grinder with nails for one or two seconds at a time. Press and release the grinder step by step until the dog's nails are shortened. For some small or anxious dogs, you need more patient, let the dogs adapt to noise and only use the low speed. This dog grinder kit includes: Dog nail grinder User Instructions USB data cable (not including adapter) Click above "Add to Cart" to buy this multifunctional nail grinder.