This watch is packed full of features. The Altimeter is surprisingly accurate. I just wish the barometer allowed you to calibrate it against a local known reading. As other reviewers have stated, the temperature really picks up your body temp while you are wearing the watch. The backlight works well and I like having the easy switch second time zone while traveling. As stated in other reviews, the volume of the alam is pretty faint, so I wouldn't count on it to awaken you. I've actually received a surprising amount of compliments on this watch which is rare for a digital timepiece. The black face is clearly an attention getter!