The new 'Full-Metal-Jacket' upgrade to the already excellent Jitterbug helps to further reduce RF noise generated from your USB connected device, such as computers, laptops, mobile devices and even cars! The two obvious changes are the outer metal case and the new hinged cover on the female USB A side of the Jitterbug. This new cover is made from a unique material based on carbon which has incredible RF-absorbing properties. This means that if you use the Jitterbug as a standalone connection in your equipment, the improvements for reducing RF Noise are even greater!