Ideal for transporting, securing, protecting and charging up to 30 Tablets or Chromebooks, Supports Tablets/Chromebooks up to 320x205x32 mm per bay, AC or USB Charging, 30x USB port charging (5V/2.0A per port), 30x AC power socket (Max 2400w), Built-in power supply for constant current and constant voltage; leakage protection and overload protection, External Master Power Switch and Breaker, Lockable - 4 keys included, Large Wheels with brakes and included handles make maneuvering easy, 3 x cooling fan (can be turned off), Fits notebooks up to 35mm wide, Modular Notebook/Tablet Dividers - can be removed, 35mm Dimensions - 600mm (w) x 600mm (d) x 1110mm (h)