If anyone wondered if the leaked HRM-Pro plus will be released soon, there is this youtuber (Vegan Cyclist) who wears it in this picture on strava. You can distinguish it by the
Amazon.com : Powr Labs Bluetooth Heart Rate Monitor Chest Strap, Heart Rate Monitor with Chest Strap | ANT+ Heart Rate Monitor, HRV Monitor Heart Monitor HRM Works with Strava Garmin Wahoo Polar
Strava app heart rate sensor pairing | Strava reintroduces BLE support - BikeRadar
Heart rate monitors for Strava: Compatible devices to track your workouts - Wareable
Garmin HRM-PRO Heart Rate Strap In-Depth Review
Strava vs Garmin HR Zones very different - how do I calibrate (just got a HRM-Pro) : r/Strava
Amazon.com: Fitcent Heart Rate Monitor Armband with Blutooth ANT+, Optical Armband Heart Rate Monitor, HRM Arm Band for Peloton IFit Strava Wahoo Zwift Garmin Watch (Black) : Electronics