Bretford intelligent charging carts provide power to devices, through specific zones within the cart, based on which zone requires the most power. The cart continues to evaluate the power needs and cycles power to the next bank. Once the power demand reduces, the cart can potentially power to all devices at once. These carts are a great option for devices that are used all day and only have a limited amount of time to charge or for more powerful devices – 90+ Watt adapters.