Rubber flaps cover both the standard mini USB port and the headphone jack, preventing the player's insides from getting damaged. However, as you'll need to plug in the headphones during use, we're a bit skeptical about the usefulness of that flap.
The Jet's main control pad is straightforward, with a play/pause button surrounded by track shuttle keys and volume controls. However, the pad is stiff, making the buttons a bit difficult to press. Plus, there's a slight lag in the interface.
A menu button on the top of the player takes you to one of two top menus, depending whether you hit it once or twice. It would have made more sense if the player used one main menu, with several submenus, for navigation.