tiantianka Ring Health Tracker for Women Men, Fit Ring with Heart Rate, Blood Oxygen, Sleep Monitor, Calories, Step Counter, IP68 Waterproof Smart Ring for iPhone & Android, No Subscription Fee (Silver, 9#) is up for auction in Electronics. The current bid is $11.00, 81% below the $58.88 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.