XO Smart Ring RS01, size 10 / black

* Smart ring with elegant design XO-RS01. * Made of durable titanium alloy and epoxy resin. * Bluetooth connection. * Tracks sleep duration and quality. * Detailed daily activity information. * 24-hour heart rate tracking. * Magnetic charging. * Bluetooth version: V5.1. * Battery capacity: 18mAh. * Charging time: about 1 hour. * Working time: about 8-10 days. * Water resistance 5ATM for daily use. * Storage space: 8M. * Compatible with Android 5.0 and iOS 10.0 and above. * Weight: 2.5g. * Size: 10.