IP68，AB2026B3，BT 5.2 

Device Size: 6.5*2.6mm

Body material: Stainless steel +Epoxy Resin

Heart rate sensor: HX3918

Function:Heart rate detection,Blood oxygen test,HRV,Sleep detection,Activity（Distance/calories/daily steps statistics / 7-day goal achievement/effective activity, etc）,sedentary reminder,Multiple sport modes

Battery capacity:  15-20mAh

Charging method: USB Magnetic wire

APP: Luck ring

Size：7 8 9 10 11 12 13