Peak, 4.3" GPS, Navigation System, SiRF Atlas V Dual Core GPS Chipset With 20 Channel Receiver, 6 LED Backlight, 4.3" Color LED, 16:9 480 x 272 Pixels, 64 MB DDR RAM, 2 GB Internal Flash For Map Data, US Maps By Navteg, User Friendly Interface, Map Display Options, 2D Or 3D, Driving Direction, Multiple Routing Selections, Shortest Distance, Fastest, No High Ways, Etc., Clear Turn Direction With Voice Prompt, Automatic Recalculation, Built In Rechargeable 1000Mah Li-Polymer Battery.