Wearable fitness firm Whoop has announced its fourth-generation Whoop Strap 4.0, which promises more accurate data collection thanks to a new sensor and a host of new features.

The new Whoop 4.0 is 33% smaller than its predecessor, but manages to maintain its 5-day battery life. The company has added a skin temperature sensor as well as blood oxygen monitoring, making it a more accomplished health tracking device beyond the strain and recovery data associated with your activity.
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