Day or night, gym or sleep, the wearable watch style O2Vibe helps you keep track of Oxygen (SpO2) and Pulse Rate. The O2Vibe Vibrates when SpO2 drops below to your customized minimum between 80 and 95%. The level of vibration is adjustable. Download the data to your O2Vibe app for Android and iOS. Records up to 12 hours during sleep and 5 hours during activity. The O2Live is not a medical device. Built in rechargeable battery charges with micro USB (cord included).