Puff House PRO rechargeable device with child lock and built-in 400mAh battery. This device is charged with a USB C cable. (not included in the package) The child lock is on the bottom black part of the device right next to the connector for the charging cable. (small black button) You can easily activate or deactivate the child lock by pressing the button 5 times in a row. If the battery of the device is discharged, the LED will flash on the lower edge, indicating that the device needs to be recharged.