I have two smart rings, $10 each. New in box. Comes with charging cable. Never opened. Stainless steel. Water proof. Silver and gold. Checks everything from blood pressure, your sleep ( whether it's how long, or apnea, even snoring, lol ), miles or daily steps walked, and a WHOLE bunch of other stuff. I have one after heart surgery. These things are sooooo cool. Hit me up, anytime.