fahkns smart health ring for women men: fitness tracker ring with heart rate,blood oxygen,sleep monitor,stress,steps counter,ip68 waterproof for ios & android,no app fees (enamel,9#) enamel 9# is up for auction in Health & Household. The current bid is $2.50, 94% below the $41.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.