The Fuse is a plug-in player it hooks up directly to a computer's USB jack. The connection, protected by a pop-off cap, is on the unit's left side. We had to remove neighboring peripherals from our PC's USB hub to accommodate the Fuse's wide, teardrop-shaped body. It measures 1.5 by 3.5 by 0.7 inches, slightly larger than some competitive models. Rio should have narrowed the device or included an extension cable. But the rounded edges make for a comfortable fit in your palm.