About this item ?Free APP Software for Android, iOS PC?The "Vihealth" App and "O2 Insight Pro" Software allow you to share all-day data and trend easily, or watch your real-time O2 level and heart rate on your phone, tablet or computer. Please download "Vihealth" from Apple Store or Google Play. ?Smart Vibration Audio Reminder?The oximeter vibrates and keeps making a "drip" sound if blood O2 saturation falls below your defined level. Vibration and sound intensity can be adjusted. ?All-day Monitoring?Checkme O2 Max records your O2 level (blood O2 saturation level), pulse rate, and motion with extremely accuracy. ?Comfort Patented Ring Sensor?Soft silicone ring sensor won't make your finger numb and never slips from your finger, which completely frees your finger. ?Up To 72Hrs Long-lasting Use?No AAA batteries required, without keeping batteries nearby, continuous using up to 3 days (72 hours) after one charge. ?Built-in Memory? O2Max oxygen reader stores four groups of 10-hour data. When the device is connected to the APP via Bluetooth, the data will be uploaded automatically. NOTE: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use.