Our 18-Unit Laptop Carts store and charge up to eighteen laptop computers and feature two surge and overload-protected 9-outlet electrical units that install inside the front or rear of carts. Includes a 3-outlet electrical unit attached to the back for powering additional equipment. A grommet hole at the back of unit provides cord management and access to electrical units. Perforated doors and rear and side panels allow for ventilation of equipment when charging. All carts have been TUV Certified to conform with UL 60950 standards for Safety of Informational Technology.