Silver metal smart ring. It's a tracker that measures heart rate, sleep time, exercise, etc. The box is torn. (See image 4) *Please note the ring size!* I initially bought a size 9, but it was too big, so I exchanged it for a size 7. (The official website states that size 7 is 54.3mm and size 9 is 59.5mm. I'm not sure if this refers to the ring's diameter or inner diameter.) Even the smallest size 7 is too big, so I gave up on using it. - Brand: Geekin - Model Name: evolt - Accessories: USB cable, instruction manual - Color: Silver - Bluetooth 5.4 - Waterproof Level: IP68 - Manufacturer's Suggested Retail Price: 23,800 yen #SmartRing #evolt #Tracker