A pair of Amazon Kindle e-readers inside M-Edge Accessories Guardian cases are immersed in water at the 2010 International Consumer Electronics Show (CES) in Las Vegas, Nevada January 8, 2010. The molded plastic Guardian case floats and safeguards Kindles in water up to one meter deep for users wanting to use them in the bath or around the pool. The cases are expected to retail for less than $100. REUTERS/Steve Marcus (UNITED STATES - Tags: BUSINESS SCI TECH)