PRICES MAY VARY. 32 Device Charging Cart: Charge 32 Chromebooks, laptops, or tablets at once with the mobile charging cart, and it is versatile Locking & Safety: Charging cart with lock & key for the front and back door, will Protect your devices when it's in working or you are moving the cart. And 2 locking caster wheels to keep cart in place Durable Construction: Our laptop charging station for classroom is made of powder-coated sturdy steel. turdy and durable, and the surface is treated with