Belkin has announced that its Ultimate Keyboard Case for the iPad is now available for pre-order. Slated to begin shipping in May, the Ultimate Keyboard Case measures 6.4mm thick and offers a machined aluminium alloy base for durability. Magnet sensors built directly in the case turn the keyboard off automatically when the case is closed, saving battery life and allowing users to instantly access the onscreen keyboard when necessary. Pre-orders can be placed through Belkin's online store, with the Black model costing $100 and the Silver model set at $130.