Feature: 1. Vibration Reminder: With vibration sensor, when the blood oxygen is detected too low or the pulse rate is too high, the ring will vibrate to avoid long term low blood oxygen state. 2. Multi Application Scenarios: Suitable for a variety of different application scenarios, sleep, running, mountaineering, daily detection, the use of respiratory oxygen machines, etc. 3. Applicable People: Suitable for snoring, using ventilators, elderly, sleep apnea syndrome, COPD people, etc., can be used in plateau tourism, long term mental work, running. 4. Comfortable and Soft: Support bluetooth 4.0, the ring is lightweight, compact ring sensor for continuous tracking and durable for most fingers. 5. Practical: Small and portable, fashionable appearance, real time monitoring of blood oxygen levels, phone app can synchronize real time measurement of blood oxygen reminders. Specification: Item Type: Wearable Pulse Oximter RingMaterial: ABS .Blood Oxygen Level Range: 70%-99% Blood Oxygen Accuracy: 80-99%: ±2%, 70-79%: ±3% Pulse Frequency Range: 30 To 250 Bpm Pulse Accuracy: ±2 Bpm Or ±2 Vibration Source: Low Oxygen Level, High or Low Pulse Rate Dustproof And Waterproof Grade: IP24 Waterproof Record Parameters: Blood Oxygen Level, Pulse, Movement Size: Approx. 38x30x38mm/1.50x1.18x1.50in Ring Size: 50-82mm/1.97-3.23in Built In Memory: 4 Sections, Each Up To 10 Hours Battery: Rechargeable Lithium Battery (Built In) Use Time: 12-16 Hours Wireless: Bluetooth 4.0 Ble Compatibility: For IOS 9.0 Or Above; for Android 5.0 Or Above Package List: 1 x Wearable Pulse Oximter Ring1 x USB Cable1 x Manual1 x Warranty Card