This model is engineered to withstand salt water and fog for worry-free use in marine environments. Take your entertainment offshore with confidence. The same Pandora stations you enjoy at home are now road worthy. Give your "thumbs up" or "thumbs down" and listen to more of your faves. Just connect your iPhone/iPod touch and open up the possibilities. The front panel design provides water resistance and durability. A simple press of a button and the front panel flips down to access the CD Slot. Now you can enjoy the CD, MP3 and WMA Music on your CD with rich and enhanced sound quality. Using your iPhone and iPod on your boat just got more convenient. Control of USB-connected iPhone and iPod via optional Wired Remote Control MW4 possible.