"The dog nail grinder is small (5.375*1.5*0.8 in) portable, easy to use and can be used on most pets with nails. Three charging methods: you can use PC, mobile power, mobile phone charger to charge dog nail clippers. If your home is a large pet, you can use the dog nail clipper to trim a part of your nails for your pet, then use. With any rotary tool, keep the hair around the nails trimmed back so it doesn't get caught in the tool, be careful. Not to heat their nails by using it too long, and don't trim off too much to avoid harm to pets. Performance parameter:Use time: 3 hoursCharging time: 3-4 hoursbattery: 600mA Ni-mh rechargeable batteryGrinder head: Copper-made coated with emeryMotor: High-quality brass shaft, fast and powerful rotation Packing list:Electric dog nail grinder X1Dog nail clipper X1Pet nail file X1Operating Guide X1USB data cable X1 Please note:For sensitive dogs or cats, he may still be scared by the sound of the dog nail grinder.It is recommended to spend 2-3 hours to familiarize your pet with dog nail grinder. The pet nail clipper is motivated by a super mute motor (noisetrimming your pets nails. Clipping the nail is no more a painful experience for them.)"