I bought this watch because I wanted to set daily alarms for different situations. The alarm only sounds for 10 seconds (or 10 beeps) and is not very loud. I'm a light sleeper but if the watch wasn't on my wrist I don't think it would wake me up. To compensate for the brief silent alarm, I set two alarms a few minutes apart. Alarm clocks are easy to set, turn on and off. Having no manual handy I don't know how the other modes work and feel quite familiar with the technology. I think one of them is the alternate time zone. When I look at the clock, there's a chance they accidentally collided and aren't showing the current time, and I'm confused until I try to push the buttons multiple times.