The unique design charges up to 36 Watt on 12 Volt systems and 60 Watt on 24 Volt systems. This makes it ideal for charging modern laptops via the USB-C port. It's also twice as fast when charging larger tablets, designed to easily charge an iPad Pro and iPhone at the same time. Perfect for where space is at a premium, ROKK Charge Pro has a sleek, ultra-compact design with a click-and-lock lid allowing the USB to remain waterproof while in use. Constructed from premium, marine-grade materials, ROKK Charge Pro is IPX6 waterproof making it completely wash-down ready.