Whoop 4.0 Fitness & Recovery Tracker (Black) + Charger Pack

This sensor-only system pairs with the Whoop app (subscription required) to deliver hyper-accurate strain, recovery, and sleep tracking. Key Features: • Sensor-only tracker with no screen — all data is delivered via the app • 24/7 heart rate variability (HRV), sleep, strain, and recovery tracking • Includes Whoop Battery Pack 4.0 and USB-C charging cable • Lightweight, low-profile, and sweat-resistant band Condition: Lightly used and in full working order. Clean band. No tears, no defects. Includes charger pack & USB-C cable. Note: App subscription not included (required for full functionality).