The Humminbird HDR 650 Depth Gauge gives you instant reliable depth readings, even at speeds up to 70 mph, and can alert you to both deep and shallow water. Easily installs in any existing 2-1/8" opening. Wires to the ignition to automatically turn on. Read the HDR 650 depth gauge in feet, meters, or fathoms. The Humminbird HDR 650 includes 2 face plates (black and white) and 3 trim rings (black, white, and silver) for matching to your dashboard. Easy-to-read backlit 1-1/4" LCD display. Transom-mount transducer with 20' transducer cable. 200 kHz, 20° cone angle. 600' max. depth. 250 watts RMS power output. 2-1/2" dia. x 4-3/4"D.