20 gauge welded steel construction. Fits most laptops that are 17” or smaller. The platform where the laptop sits is 12-1/4”H x 17-1/4”W and comes with a cushioned pad. When the door is down the length from the back of the cabinet to the top of the door (platform) is 18-3/4”. Electronic keypad lock run by 4-AA batteries. No need for keys. Has administrative password and user password. Both can be changed. Keypad has two backup emergency means. The first is an external power source. If the battery fails, it plugs into the keypad. The second is a key, if the code is forgotten. This is located under the handle plate. The platform has adjustable elastic straps to hold the laptop securely in place when closed. The left and right sides of the unit each have a grommet 1-1/2” in diameter for power cords to allow for charging when the laptop is secured. Cell phone and camera storage holders included. Powder coated charcoal color in stock. Space in bottom for a power strip. Shipped UPS. Shipping weight is 20lbs.