Combo USB 3.0 & HDTV HDMI 1.4 Male to Female Extension Cable with Waterproofable Mount Shell Length: 100cm These thermoplastic waterproof USB/HDMI connectors are great in marine applications. They are sealed with potting, which means that if the caps breaks, your device is still sealed. The connectors are waterproofable to IP67 when connected, and the thermoplastic housing has no risk of rust.