Whistler's RLC-100 is a compact, full-featured red light/speed camera warning system. The device compares your vehicle's current location (using GPS) against an on-board database of thousands of known red light camera and speed camera locations. Free updates are included for one year, installable via USB on your home PC, and you can manually enter in up to 100 of your own custom locations. Plenty of bonus features are also included, such as speed alerts, a tripmeter, and a digital clock.