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The SleepU Wrist Oxygen Saturation Monitor is rechargeable and wearable, will vibrate when your blood oxygen level is low. No beep alarm to disturb your sleep partner! Sleep better with adjustable vibration! Unlike duckbill sensor, it's a relief like wear nothing, don't make your finger numb. No batteries needed! One charge for 2 nights (over 16 hours), please note each record will be ended automatically after 10 hours. Strongly recommend people who have snore or CPAP machine. Quick Guide 1. Use your smart phone or tablet (compatible with Android 5.0+, iOS 9.0+) to download the ViHealth APP on Google Play or APP Store. 2. Wear the device overnight. 3. Take off the device after get up, sync your data to app to check your data and trend. Or connect with PC/laptop, export the blood oxygen report to your family or friend!