【Feature】 【1】All-day Monitoring: It can be used continuously tracking of blood oxygen level, pulse rate and body motion for the whole day. (Up to 16 hours) 【2】Smart Readings Reminder: If the O2 level is lower than the preset threshold and heart rate is lower or higher than the preset threshold, the device and the APP will notify you and mark it in the report. 【3】Detailed APP & PC Reports: Free APP & PC software provides graphic O2, PR report and trends of data. Unlimited sharing of PDF and CSV reports. 【4】Built-in Memory: O2ring device stores four groups of 10-hour data.When the device is connected to the APP via Bluetooth, the data will be uploaded automatically. 【5】User Friendly: The O2ring runs automatically when you wear it.The patented comfortable soft silicon sensor ring is light and convenient. 【6】Rechareable: Long battery life. It can be used for up to 12-16 hours after fully charged. 【7】NOTE: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use. 【Specification】 WEIGHT：0.53 oz / 15g DEVICE DIMENSIONS：1.5'' x 1.2'' x 1.5'' RING PERIMETER：2.0'' - 3.2''/ 50-82mm WIRELESS：Bluetooth 4.0 BLE BATTERY LIFE：Rechargeable lithium-polymer, 3.7 Vdc; 12-16 hours for typical use DEGREE OF DUST &WATER RESISTANCE ：IP24 RECORDED PARAMETERS：Oxygen levels, pulse rate, motion COMPATIBLE COMPUTER SYSTEM：Windows 7/8/10；macOS 10.15.3 or above WORKS WITH：iOS 9.0 or above, iPhone 4s/iPad 3 or above; Android 5.0 or above, with Bluetooth 4.0 BLE OXYGEN LEVEL RANGE：70%-99% PULSE RATE RANGE：30 to 250 bpm MEASURE INTERVAL：1S DISPLAY INTERVAL IN APP DATA CHART：4S BUILT-IN MEMORY：4 sessions, up to 10 hours for each session 【Package include】 1X O2Ring™ Continuous Oximeter 1X Micro USB cable 1X User guide 【Feature】 【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 adjustable vibration and audio reminder stirs you to wake gently if blood O2 saturation falls below your defined level. 【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 9 nights(72 hours) after one charge, with an one-year warranty. 【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. 【Specification】 WEIGHT(MAIN UNIT)：0.63 oz / 18g DEVICE DIMENSIONS：1.9'' x 1.0'' x 0.7'' RING PERIMETER：2.0'' - 3.0'' WIRELESS：Bluetooth 4.0 BLE BATTERY LIFE：Rechargeable lithium-polymer, 3.7 Vdc, 72 hours for typical use DEGREE OF DUST &WATER RESISTANCE：IP22 RECORDED PARAMETERS：Oxygen levels, pulse rate, motion COMPATIBLE COMPUTER SYSTEM：Windows 7/8/10; macOS 10.15.3 or above WORKS WITH：iOS 9.0 or above, iPhone 4s/iPad 3 or above; Android 5.0 or above, with Bluetooth 4.0 BLE OXYGEN LEVEL RANGE：70% - 100% PULSE RATE RANGE：30 to 250 bpm MEASURE INTERVAL：1 second DISPLAY INTERVAL IN APP：2 seconds BUILT-IN MEMORY：4 records, up to 10 hours for each 【Package include】 1X Checkme™ O2 Max Wrist Oxygen Monitor Refurbished1X USB cable (Micro)1X User guide On Feb 21, 2023 at 01:32:42 PST, seller added the following information: