Battery - Built-in lithium-ion battery, no replacement, rechargeable via USB C cable, illuminate 16-56 hours after fully charged 20 Minutes Timer - Switch switch to “20” to start the countdown. The rabbit lamp will automatically turn off after 20 minutes Dimmbar - Press the rabbit to adapt the brightness (2 intensity), the first press for dark, the second press for 5 minutes the brightness is up, the second press after 5 minutes the lamp turns off after 5 minutes Portable - Child size, easy to carry for toddlers Multi-function - night lamp with warm light helps children fall asleep, decorate girl’s room, light for good night story, reading.