The DryCASE DC-17 Waterproof Tablet Case was designed to create a watertight vacuum seal. Simply slip your tablet or e-reader inside the DryCASE and lock the clasps. Position it how you'd like to use it in the case, then use the vacuum hand pump (included) to remove the desired amount of air. Remove all of the air so that the case is flush against your device screen for touchscreen access. A built-in three-way headphone jack lets you use both stereo headphones and a microphone to listen to music or watch a movie.