The Ergotron YES charging cart charges, secures and transports 1-36 min-laptops like the Chromebook, Ultrabook and Surface Pro in a strong, adjustable cart. Adjustable shelves install at any height in 2/3" increments long the 27" -high installation track. Store devices on their long side, in landscape orientation, or on their short side, in portrait orientation, as dictated by devices size and the position of the power inlet and on/off button. Cart ships with shelves arranged for landscape storage. Features Power Shuttle® power management technology, the system that efficiently charges up to 40% faster than a standard round-robin system. With just one power cord plugged into a standard wall outlet, it safely prevents overloading of electrical circuits by automatically determining the maximum number of devices that can be charged at one time. Keyed locks front and back engage a two-point locking system for security. Padlock brackets position your padlock to block access to the front and back latches for extra security. The two directional lock casters make the cart easier to steer. How? Directional lock casters don’t swivel – they lock the direction of the casters so they move in a straight line. Press the tabs of the directional lock casters to lock their direction when you need to move more than a few feet. Release the tabs so the casters swivel when you need to maneuver into tight spaces.