Specification: Size: 13.7 * 3.5 * 2.5cm Applicable to 2nd 5th battery Material: ABS resin, PS resin, brass Charging time: 2 hours (USB rechargeable) Long usage time: 300 minutes Product size: 13x2.8cm HOW TO USE: Step 1: Depending on the size and characteristics of the pet's nails, choose the appropriate port for your pet. Port 1 is for medium-sized pets for sharpening nails, Port 2 is for small pets for sharpening nails, Port 3 (on the side) is for large pets and for quick sharpening. Step 2: Hold the nail grinder in place with one hand and turn it on. While holding the pet pillow with your other hand, gently insert the pet nail into a hole, and then start grinding the pet nail. Tips: If the pet is using a nail grinder for the first time, it is recommended to grind the sharp fingernail or long consumables first, but not too much to avoid bleeding. For the safety of the animal, it should not take longer than 5 seconds for a time. Make sure to set the grooming angle so that the animal's nails are polished. Cleaning method: Gently touch the surface of the nail grinder with an eraser, paper or cloth to remove the nail powder from the nail surface