Wellue O2 Ring Oxygen Monitor / Pulse Oximeter excellent condition, tested.

This is a Wellue O2 ring. Originalretail was around $180. I used it for about a week in May and itworked well. Combined with the app, it will track the wearer\'s heartrate and blood oxygen level to help appraise their health. This isgood for someone who suspects sleep apnea and other breathing andblood oxygen issues, especially while sleeping. I tested fine andhaven\'t used it since so here it is for sale. See the photosincluding a few minute recording on the app to confirm function. BTWputting it on your finger activates it once charged. Don\'t hesitateto ask any questions. I\'ll answer what I can. Thanks for reading.