This is a scanner radio receiver. Radio Shack Pro-668 is the Whistler WS1080. It is functionally the same as the former GRE PSR-800 for the most part as well. The Pro-668 is basically the same radio as the PSR800 but the newest firmware will allow you to charge the scanner when connected to the USB cable (only when there is no audio-not receiving). Like the WS1080, the backlight has a blue hue.
Only a few settings/options are available in the scanner itself
75/100th in 48hrs, 42 degrees. 18:38 Tom BFO