Sound and signal pass right through the material, so you can use your equipment normally in the case. If using a stylus, it can be used through the clear window on the case. The Connected Electronics case is ideal for larger MP3 players, portable walkmans or larger PDA navigation systems that connect to GPS. The case features the "TC" Aquaclip, a waterproof wire-through seal that allows wires up to 2.5mm (.1") to be used with your equipment. This case is recommended for surface use mainly and is not designed for continued submersion. The airtight seal means your equipment will float safely if you drop it in water. Comes with a detachable neck cord. Outside dimensions are 9.5 x 5.5 x 1.25". Backed by Aquapac’s 3-year global warranty.