The gray double-frame Adjustable-Shelf 48-Slot Charging Cart for Select Devices Up to 7" from Black Box allows you to store, secure, transport, and charge up to 48 e-Readers, iPads, tablets up to 7", and other devices. The cart features a rapid wiring system that can reduce the time to deploy by as much as 75%, and a laminate working surface that can support up to 150 pounds and double as a podium or writing surface. The unit's sturdy construction makes it a durable choice, and its flexible mounting system lets you continue using the Charging Cart when you upgrade your devices. The 48-Slot Cart offers front and rear cable management, front door and rear panel access, and a charging timer that cycles between four banks every fifteen minutes to prevent electric shock. The cart has a tambour door and comes equipped with a push handle, a power cord wrap, and four casters, two of which lock for added stability and mobility.