美国采购需求：运动监测臂带、健身追踪器心率监测器、腕式智能心率监测器、臂带心率监测器、心率监测器

I'm looking for some details regarding the product capabilities related to heart health monitoring. Specifically, I'd like to know if it is equipped to measure Heart Rate Variability (HRV) and whether it retains HRV data in its internal memory. Additionally, I'm curious about how long it can store heart rate information in memory. Furthermore, could you provide insights on the application that pairs with the device? Understanding these features is crucial for evaluating its suitability for my needs. Any additional information on these aspects would be greatly appreciated.