fittr hart x2 smart ring for women & men, buy sizing kit first, advanced health & fitness ring with sleep tracker, 8+ days battery, 50m waterproof, no subscription, charging case, sterling gold 7 is up for auction in Electronics. The current bid is $11.00, 96% below the $249.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.