Rechargeable with a built-in battery, this Electric Baby Nail Buffer is designed for gentle protection. The grinding head stops when the pressure gets stronger to prevent injury in case of accidental contact with baby s fingers. This 3500 Rpm is also specially designed for trimming the edges and first-time use by new parents. You can choose from four speeds–the lowest is for newborns and the highest for adults.For grooming at night, the Nail Buffer has a 360° fog Led light source without glare and it s quiet (minimum noise of 35dB), so it won t wake a sleeping baby.