Check the listing for details. Checkme O2 Max Pulse Oximeter for SpO2 and Heart Rate Tracking Continuously. Condition: New. Listed at 229.99 USD. About this item Product details 【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. 【Package include】-- Checkme™ O2 Wrist Oxygen Monitor；Data/Charging；USB Cable；User guide WEIGHT(MAIN UNIT)：0.63 oz / 18gDEVICE 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 useDEGREE OF DUST &WATER RESISTANCE：IP22 RECORDED PARAMETERS：Oxygen levels, pulse rate, motion COMPATIBLE 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% - 100%PULSE RATE RANGE：30 to 250 bpmMEASURE INTERVAL：1 second DISPLAY INTERVAL IN APP：2 seconds BUILT-IN MEMORY：4 records, up to 10 hours for each