>> Features: Ultra-quiet and low vibration: Our Nail Trimmer is equipped with an ultra-quiet but powerful motor. It gently removes thin layers of the nail with minimal noise (under 50dB) and vibration so that sensitive pets won't be anxious or scared. Stays cool: Special coated pet-friendly grinder rotates at just the right gentle speed, preventing friction burn. Usb charging: No need to fumble around for batteries as it's USB rechargeable with up to 5 hours of continuous use. No more over-cutting: Our nail trimmer slowly trims away the layers of your dog's nails. No more worries about over-cutting, nasty pains or bleeding. Easy to clean: To clean your trimmer, just use a soft wet towel and gently brush away any nail dust. >>Specifition: Battery: bulit-in battery Charging mode: USB Charging Charging time: 1.5 hours Battery life: 7 hours