Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A big letdown

Some things you should know.1. My watch lasted 1 week past the warranty.2. If the watch gets too much light or gets too warm it goes bad. You can't tell if it needs recharging because the power gauge stops working. The only way to know the power is low is if it resets and looses all its data.3. Adding phone numbers and other info via TWO buttons is a long and painful process.4. When the watch goes nuts and looses all of your phone numbers, time and other settings, you become a little nuts yourself.