Specification： WEIGHT：0.53 oz / 15gDEVICE DIMENSIONS：1.5'' x 1.2'' x 1.5''RING PERIMETER：2.0'' - 3.2''/ 50-82mmWIRELESS：Bluetooth 4.0 BLEBATTERY LIFE：Rechargeable lithium-polymer, 3.7 Vdc; 12-16 hours for typical useDEGREE OF DUST &WATER RESISTANCE ：IP24RECORDED PARAMETERS：Oxygen levels, pulse rate, motionCOMPATIBLE COMPUTER SYSTEM：Windows 7/8/10；macOS 10.15.3 or aboveWORKS WITH：iOS 9.0 or above, iPhone 4s/iPad 3 or above; Android 5.0 or above, with Bluetooth 4.0 BLEOXYGEN LEVEL RANGE：70%-99%PULSE RATE RANGE：30 to 250 bpmMEASURE INTERVAL：1SDISPLAY INTERVAL IN APP DATA CHART：4SBUILT-IN MEMORY：4 sessions, up to 10 hours for each session 1X O2Ring™ Continuous oximeter 1X Micro USB cable 1X User guide Detail： 【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. On Feb 21, 2023 at 01:04:09 PST, seller added the following information: