WHOOP is a unique wearable fitness device that offers continuous monitoring of physiological data, including heart rate, respiratory rate, resting heart rate, heart rate variability, skin temperature, blood oxygen levels, daily activity and sleep so users can better understand their overall health and wellness status and track their progress over time. Excellent condition This listing includes: -WHOOP 4.0 device -Charcoal grey hydroknit band -Battery pack -Charging cable