Living legendary starts with sleeping smarter. Our smart ring tracks everything from how you’re sleeping to how you’re performing at the gym or on the field. Track oxygen, sleep, heart rate, steps and multiple sports with this Apple and Android compatible ring in 4 sizes.

Specifications:

• Ring size diameter (mm): Size 8: 18.1mm, Size 9: 18.9mm, Size 10: 19.8mm, Size 11: 20.6mm
• Weight: 4.4g
• Chipset: RF03
• APP: QRing
• Compatible System: Android 5.1 or above, iOS 8.0 or above
• FLASH memory: ROM512KB
• BT: 5.0 low power consumption BT Chip
• Sensor: STK8321
• Heart Rate: Vcare VC30F
• Battery: 17mAh Polymer lithium-ion battery
• Charging time: About 1 hour
• Life time: 5-7 days of use, 15 days on standby
• Waterproof: IP68
• Appearance material: stainless steel

Size Information:

• Size 8: Dia=18.1mm; Perimeter=56.9mm
• Size 9: Dia=18.9mm; Perimeter=59.5mm
• Size 10: Dia=19.8mm; Perimeter=62.1mm
• Size 11: Dia=20.6mm; Perimeter=64.6mm

How to measure the size:

1. Please use a non-elastic rope
2. Pull up
3. Leveling