The MDMTAB36 includes a unique Power Manager that works with a standard 15 amp electrical circuit and is designed to analyze power requirements. The system uses a Round Robin charging cycle that constantly evaluates the demand for power from each of the six, six-outlet power strips and concentrates on the devices that need it most. The system inherently senses when batteries are nearing a full charge and automatically reduces power as required. The Power Manager not only prevents circuit tripping, but also allows each set of device batteries to cool down between charging cycles, thereby extending their life. Bretford Carts part of a large selection of office furniture and business equipment, whether for a home office or traditional office. Bretford Basics MDMTAB36 36-Unit Tablet Cart is one of many Charging Carts & Stations available through Office Depot. Made by Bretford.