Sony Marine products are splash-proof and meet IPx5 standards. IPx5 indicates the resistance of a product to water spray jets (simulating a severe splash at a ratio of 12.5 liters/minute) at a distance of 2.5 meters for a period of three minutes in all directions. These products give you peace of mind when you're on the water. USB 1-wire receivers allow you to connect, charge, and control many digital music players