One of the keys to having a sensor last a long time, or the adhesive. This one lasted 6 days and just came off. I thought I had problem from the beginning because there was a crease in the white bandage. I shold have fastened it down with adhesive, but I had a lot of other things on my mind and hndsight is 20/20. I'm planning on putting the next sensor on Wedneday so I'll been through with the calibration before I take off on Thursday.