Additional top inner shelf can be adjusted in 1" increments to hold collateral material Top cabinet features a padded surface that provides a working surface for collateral or presentation material Each rubber-coated divider is spaced 1" apart Ships fully assembled except for the casters and side pull handle Features 5" casters, two of which are lockable Traditional lock and key system includes two keys Sufficient holes for provide air circulation to prevent overheating while your tablets are charging. Power is 120VAC/60Hz and includes a 15' power cord suitable for a North American outlet Two 16-outlet vertical electrical outlets are provided to maximize space within the cabinet Electrical cords can remain powered through two small holes on the bottom of the unit