Here we have a technology wrist watch that takes the fun out of fishing.The Hummingbird SmartCast Fish Finder Watch uses a floating sonar sensor attached to the fishing line (it weighs about 1 oz.) and has an operating radius of 75?, transmitting real-time views of fish to the display unit you wear like a watch. The sensor reads water depth up to 100? with a 90? sonar beam to find the sport where fish hide. All controls are operated from the one-touch wrist unit, including the fish proximity alarm, sensitivity level, depth range, and fish identifier. The remote sensor provides 400 hours of continuous usage, and automatically shuts off after it is removed from water to conserve battery life.