Bluetooth Connectivity and USB Input—This marine radios for boats can use your smartphone to play music and wirelessly control, but also use USB to input a huge amount of resources. Adjustable Screen Brightness—The brightness of the marine audio screen is adjustable, so you can see the screen clearly and comfortably at midday or midnight. Open Box Condition Notice. Items are in perfect working condition. Items may have some minor signs of use, and the original protective wrapping may be absent or the item may be repackaged. All accessories will be included.