Typical of electronic watches has more features than necessary. By accident and reading the instructions in a canoe it started working in about 5 min. Works great shows fish and structure gives depth and water temp even tells time. Only thing I would change is buttons can get pushed accidently while sleeping or doing everyday chores this throws it into a mode other than time. Usually it goes to fishing mode which according to the instructions runs down the battery at a faster rate as it must act as a radio reciever. If the buttons had been shielded it would be a perfect product. Customer service was great they told me it was water resistant some thing I couldn't find in the instructions. Eventually I plan to use as a bobber/sonar buoy and see the crappie taking the bait how cool is that.
I bought this for my husband for his birthday and was pleased with the results. It's pretty obvious that the fish need to be very close, nearly right underneath for the sensor to pick them up. However, it really made fishing more interesting and worked great as a "bobber" or cork. My husband did say that it was amazing how well it worked for the money but that it was a little strange to look at his watch while fishing. Maybe the version of this product that straps to the fishing pole might be worth considering.