The Wellue Wearable Chest Strap Bluetooth Heart Health Tracker is a sports heart rate monitor that provides accurate heart rate measurements. 

The device features Bluetooth connectivity for easy syncing with iOS and Android devices, and comes with a free app for monitoring heart rate and overall health. 

This chest strap tracker is ideal for fitness enthusiasts looking to track their heart rate during workouts, ensuring they stay within their target zone for optimal results. Can be used as a thumb tracker.

Selling because I need one that includes oxygen monitoring.  BTW this one found a heart problem and I had an ablation to correct the heat beat.