The Whoop 4.0 is a versatile activity tracker suitable for both indoor and outdoor use. Whoop 4.0 is a reliable tool for tracking your fitness goals and staying healthy on the go, also tracks sleep, hrv, rhr, heart rate variability and loads more! Comes with x 1 battery and cable. X2 wrists straps, one pink and one black Both wrists straps show some wear but work well.
eBay