The OV-Watch® Sensor 2 Pack contains the specialized biosensor to be used only with the OV-Watch Fertility Prediction Device. This sensor is a non-allergenic device used by the watch to gather readings from your skin under sustained contact. Each Sensor is good for one cycle and should be replaced at the beginning of each cycle. The expiration date for an unopened sensor is published on the foil package and Sensor Box label.
I purchased the OV Watch and 3 sensors and ended up pregnant the first month, so I didn't want the extra sensors to go to waste. The expiration date for this package is 7/23/2009 - I couldn't get a good picture, but will try again on request. Please email me with any questions.
Thanks for looking!!!