I had this for a day and so far it's worth it. I'll be using it for tasks at work, tracking study times and breaks, workouts, and cooking at home. I got it because I find smart phone timers to be unreliable and unwieldy. Too often do the smartphones simply quit timing. Or they simply don't sound an alarm because of some glitch. Even if they don't glitch I still need to fiddle with unlocking the phone and then switching back to the timer app. Smartphones are too heavy and delicate for workouts, too distracting for studying, and I dont want to get grease or risk liquid on my phone while cooking. This device is so much more convenient and probably much more reliable.All of the descriptions I could find (even on competing sites) don't say clearly what battery it uses, only implying it uses AAA batteries but it really uses CR2032.It is very light weight and feels like it is fairly durable. I haven't sat on it like the other reviewer but I imagine if I have something in my pocket pressing on the screen, then i sit on it, I could see it cracking the screen. So I guess don't sit on it. The colored plastic feels like it is slightly rubbery so the grip feels nice.It comes with a removable clip but I don't see many use cases. When the clip is attached it gets in the way of the magnets to stick to metal things. Without the clip the magnets are strong enough to stick to all the metal surfaces I tried, except stainless (magnets do not stick to stainless).The alarm is loud enough I easily hear it two rooms over in a quiet home. It might be sufficient in a professional kitchen or other loud environment but I don't work in a kitchen anymore so I can't really try it out. It'd be cool if there was a low or high volume setting but there is only on or mute. The screen flashes its light when time is up so it has visual alerts as well. When time is up it starts counting up. There is no way to stop the alarm without stopping the count up.so far it's a great product and the only things I wish it had is water resistance and some sort of alarm volume control besides on or mute.