The Toughbook 54 laptop from Panasonic uses the latest advances to create a laptop 2 lbs. lighter and 0.5" thinner than the competition. It features a spill-resistant, full magnesium alloy design, hard drive heater, backlit keyboard. It is the only semi-rugged laptop that offers an optional 2nd battery allowing hot-swap battery replacement without the need to shut down or hibernate. It is also the only laptop in its class to offer dual drives, another feature that makes the Toughbook 54 one of the most versatile and advanced semi-rugged notebooks on the market.