This monitor is great when it works. I bought mine 6 months ago, and now it has ceased working. I replaced the battery, and still nothing. I would complain to Omron, but because it was so cheap, it hardly seems worth it. Especially if the next one fails as well. Also, the chest strap is too big for me (I wear a size 8 in US women's clothing, 32 in bra size). Even if I wear it as tight as it goes, it slips around. I should have looked at smaller models, so that's entirely my fault. The short lifespan of the device is most definitely not my fault however.