The Eco Terra is an IPX7 waterproof iPhone/MP3 player case with two built-in waterproof speakers and an audio out jack. The Eco Terra floats and is submersible in water and is powered by 4 C-Cell batteries or included AC Wall Charger. The two full-range 3" forward firing speakers provide a crisp clean sound and can be played in virtually any position (open, closed, upright, onside, or upside down). The internal waterproof storage compartment holds and protects your keys, MP3 player, credit cards, drivers license and cash, keeping it save from sand, sun and the water. The heavy duty industrial design includes a platform to vertically stand your case while open or closed. The Eco Terra also has a uniquely designed exterior pressure release valve that ensures your case is closed air tight and is easily opened at opened at low and high altitude.