The WHOOP 5.0 Peak Obsidian Peak SuperKnit is a portable, screenless fitness tracker designed for in-depth health, sleep, and training load analysis. This device collects data 24/7, including heart rate, heart rate variability (HRV), blood oxygen saturation (SpO₂), skin temperature, and other metrics to calculate recovery, strain, and sleep quality scores. The WHOOP 5.0 offers over 14 days of battery life on a single charge and supports wireless charging with the PowerPack, allowing you to recharge without removing the band. The SuperKnit strap in Obsidian color is made from breathable fabric, ensuring comfortable all-day wear; the strap design is removable and replaceable. The included 12-month Peak membership grants access to advanced analytical features: stress monitoring, biological age assessment (Healthspan), health trend analysis, and additional tips for optimizing recovery and training. The WHOOP 5.0 supports Bluetooth Low Energy connectivity, integration with the WHOOP app, automatic firmware updates, and moisture protection rated at IP68. The package typically includes the WHOOP 5.0 sensor, SuperKnit Obsidian strap, wireless PowerPack, and one-year subscription activation.