Digital Car Clock (630-0830) Features Faxback Doc. # 8698 -12-hour display mode. -The Fast and Slow buttons make time adjustment simple and easy. -Red LED display with Dimmer switch. -High precision quartz crystal controlled circuitry. -Operates from 12 volts DC (standard vehicle power). -Simple, do-it-yourself installation. -Suited for negative ground electrical systems. -Provided with external fuse protection. -When ignition switch is turned off, display is off. (smc-03/04/94)