The HDR 650 gives you the performance you need with depth readings to 600' at speeds up to 70 mph. It mounts in a standard 2-1/8" diameter hole and includes 2 face plates (White & Black) and 3 trim rings (Black, White, & Silver) for your own custom look. Completely waterproof, it features a large, 1-1/4" backlit LCD display, shallow & deep alarms, and reads in feet/fathoms/meters. Includes a transom mount transducer.