The G4’s unique design boasts a wide 4-inch display screen and a sleek black design with a rounded casing. This effect makes users feel they are viewing navigation and movies on a flat screen TV. The G4 also has an innovative button display which functions as an easy-to-use touchpad. To improve GPS performance, G4 integrates the e-compass and G sensor. This allows drivers to receive guidance and stay on course in areas such as tunnels and bridges, where it is difficult to receive a good GPS signal. The added built-in Bluetooth functionality allows users to connect their cell phones to the G4 while driving.