Deluo 31-311-12 USB GPS for Laptop Computers with Microsoft Streets and Trips 2007 DVD Cost effective GPS solution for your laptop that includes a DVD with street-level maps of the US and Canada 12 parallel satellite-tracking channels, with built-in WAAS demodulator for unmatched accuracy and signal reception Sony's newest 4th generation GPS chip provides superb performance and delivers the fastest possible satellite acquisition times Features internal battery for real-time clock and fast start up, LED indicator, and a base magnet for easy mounting Sturdy waterproof construction allows all-weather usage, and is backed by a manufacturer's 1-year warranty