100% safe, suitable for over 4 years and people with eye problems: curved fit and recessed cutter perfectly separate fingertips and nails for greater comfort and safety Powerful, fast cutting and grinding without lag, also suitable for thick and hard nails 2 hours fast charging, 5 hours battery life, can be trimmed more than 40 times, standby time up to half a year 40db low noise design, you can use it anytime Nail scraps storage: Nail shavings generated when cutting nails will be collected in the storage box of the product for easy cleaning