How does it work? The sensors are supposed to detect changes in electrolyte levels in your saliva and cervical mucous. You place the oral sensor on your tongue every morning, before you eat, drink, smoke, etc. The monitor will track the trends in your electrolytes and looks for what they call a Cue Peak. Once the Cue Peak is identified, the monitor will populate your fertile window. The vaginal sensor is supposed to determine if you ovulated by looking for the trend that shows a move from estrogen dominance to progesterone dominance. The readings will be higher than pre-ovulation readings and stay high through the luteal phase. Their website boasts that it is 98.3% effective. Word of warning, don't try to interpret the readings. The numbers don't really mean anything, the trend is what you look at. There is an online community and an app for users. If you are having trouble deciphering your chart, there are specialists in the forums that can help you. The monitor runs $349 for the traditional and $299 for the mobile.
Below is my chart from last month. You can see from my temps when I actually ovulated (which also coincides with my positive urine ovulation test) and see that my vaginal readings were low.
If you have used the Ovacue monitor, please let us know what your experience with it was by commenting below.