Stores, charges and simultaneously synchronises 16 tablets with or without protective cases. Accommodates all USB - powered tablets including iPad, Android tablets, Kindle Fire and more. Cases include Otterbox, Griffin Survivor and other similar sized cases. A robust dual locking system with locks located on top of the trolley to avoid damages to the lock and key during movement within the school, especially through doorways. When the device is fully charged but still plugged into the power supply our intelligent charging system will stop delivering power. Only when the device reaches the point of requiring additional charging will the charging system deliver any more power. When the device battery reduces to a certain level recommended by tablet manufacturers our board detects when the device requires power and provides it until the devices are fully charged again.