Cell phone cases will usually just protect a phone from standard drops and scratches, but Concord Keystone Trading Limited said it will unveil its new line of waterproof cases at the upcoming Hong kong Electronics Fair.

"Visitors to the booth will be able to see a demonstration of the iPhone sealed in the waterproof Keystone ECO MarineCase submerged in water," the company said. "The MarineCase protects the iPhone 4S/4 up to 20-feet below the water's surface and users can capture video and share it without leaving the swimming pool or ocean."

The NautiCase is described as a heavy-duty case for both the iPhone 4 and 4S that protects against splashes, snow, sand and dust. The case is made from high-impact polycarbonate and features a protective film that allows people to easily utilize the device's touch screen. Concord Keystone said this product is the "workhorse of iPhone cases and protects it from everyday mishaps."

There are other waterproof cell phone covers, including the DryCase, a vacuum-sealed waterproof case that will protect devices against even the most serious water contact.