This heart rate monitor is a very basic unit. It works, most of the time, for what it says it will do. There are some drawbacks. There is no feature to estimate calories burned which is only a guess but a nice feature. There is a back-light on the watch which is nice if you wear this as a watch also, which I do. It has a stopwatch, an alarm clock and you can adjust the watch to international time (military time) or regular American time. It also does a good job keeping track of the date. My biggest pet peeve with this unit is that if you so much as bump a wall with it, it scratches the paint right onto it and it doesn't want to come off. Other than that, this unit is great but be aware of what your getting yourself into.