Check the listing for details. Wellue Rechargeable O2Ring Pulse Oximeter Continuous Tracking SpO2 & Pulse Rate. Color: Black, Condition: New. Listed at 159.99 USD. MODEL：O2Ring RING PERIMETER：2.0'' - 3.2''/ 50-82mm WEIGHT：0.53 oz / 15g DEVICE DIMENSIONS：1.5'' x 1.2'' x 1.5'' DEGREE OF DUST & WATER RESISTANCE：IP24 BATTERY LIFE：Rechargeable lithium-polymer, 3.7 Vdc; 16 hours for typical use CHARGE TIME：2-3 hours WIRELESS：Bluetooth 4.0 BLE BUILT-IN MEMORY：4 sessions, up to 10 hours for each session RECORDED PARAMETERS：Oxygen levels, pulse rate, motion OXYGEN LEVEL RANGE：70%-99% PULSE RATE RANGE：30 to 250 bpm SPO2 ACCURACY：80%-99%: ±2% 70%-79%: ±3% PULSE RATE ACCURACY：±2bpm or ±2% MEASURE INTERVAL：1S DISPLAY INTERVAL IN APP DATA CHART：4S COMPATIBLE COMPUTER SYSTEM：Windows 7/8/10; macOS 10.15.3 or above COMPATIBLE WITH：iOS 9.0 or above, iPhone 4s/iPad 3 or above; Android 5.0 or above, with Bluetooth 4.0 BLE About the item✅【Continuous Monitoring】 O2Ring can continuously monitor your blood oxygen saturation and heart rate, generate trend reports on APP or PC software, intuitive reports show your health condition in detail. You can share your reports in PDF/CSV form.✅【Smart Notification】O2Ring will notify you by vibrating your finger or beep on phone (when connecting) if it detect abnormal oxygen saturation or heart rate, then you can take a break to recover. You can adjust the threshold on the APP.✅【Wearability & Portability】The patented ring sensor made of soft silicone completely frees your finger while ensuring accurate measurements, it never slips off your finger. You can check your health status anytime anywhere.It is the lightest and the smallest oxygen monitor.✅【Intelligent Data Management】Built-in memory can enables it to work independently without a phone. The data will be synced with your APP automatically when connected with your phone, and you can also sync the data with your PC using the cable provided. Unlimited storage at no additional charge.✅【Note】Accurate reading will be displayed within 10 seconds after you stop exercising and calm down. It will shows "--" if your finger move too much. ✅NOTE: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use. Package include 1X O2Ring pulse oximeter 1X Micro USB cable 1X User guide