Warm reminder: without battery, please purchase as needed Product name: pet nail polisher Charging time: about 1 hour Use time: about 240 minutes Battery capacity: 600 mAh Battery type: lithium battery (without battery, please purchase as needed) Speed adjustment: 1st gear / 2nd gear Product size: height 132 width 32mm Product weight: 110g (stand-alone) WARM TIPS: It will be better if pets are grinded nail once every 1-2 weeks. Please properly cut dog's nails if the nails are too long to reduce long grinding time. If it is the first time you use a pet nail grinder for your pet ,do not grind too deeply so that your dog can slowly adapt to the nail grinder, and protect your bloodline of pet nails. If your pet is sensitive, you can grind nail when it sleeps, or you can grind one paw once time.