Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Floating transmitter has extremely short battery life.

The first day I used the RF-35 unit, I was very happy with it. It was accurate on the depth and water temperature. I used it from my fishing kayak and when the fish alarm sounded I immediately cast and pulled up a crappie. They swim in schools and I was thrilled that it worked.On my second kayak fishing outing a couple of days later, the watch receiver kept saying "no signal". I made sure I was using the correct channel, the distance wasn't too far, etc. It turned out the transmitters battery was dead. I had a second transmitter with me (the RF-45) and that one gave me a signal, but its non-replaceable battery also died by the end of the day. At $25 per RF-45 transmitter unit, I realized it was cheaper to buy the Norcross Hawkeye F33P Fish Finder that I can use with rechargeable triple-A batteriesNorcross Hawkeye F33P Fish Finder. I have used the Norcross only once so far and am happy with it.