- Eco Terra waterproof iPhone/ MP3 audio case with built-in waterproof speakers (x2) and Audio Jack - Floats!! TERRA floats in water with standard load - 3.5mm audio cable (internal) connects to your audio device's audio jack connection - Multifunctional control buttons (external) located at the top of the TERRA operate the audio device connected to the 3.5mm cable - Internal neoprene housing and elastic retention straps securely hold the audio device in place behind the closed clearview front panel - (2) 3" full range forward firing speakers - 3.5mm audio AUX-in on back of unit - Superior battery life and playtime - Battery and power adapter power options - use (4) C batteries or connect to a wall power outlet with the power adapter - Portable outdoor or fixed indoor play - Internal waterproof storage compartment with clearview front panel holds and protects your keys, MP3 player, credit cards, drivers license and cash safe from sun, sand and water - Designed to ;lay with clearview front panel open or closed - Industrial design includes polycarbonite case for strength and shock resistant rubberized edging - Uniquely designed exterior waterproof pressure release valve ensures your case is closed air tight and easily opened at low and high altitude - Detachable carabiner clips for hands free usage and convenient hanging and securing options - Removeable nylon shoulder strap for use with carabiner clips<