Review on LIVLOV V9 Bluetooth ANT+ Heart Rate Monitor Armband - Rechargeable HRM Sensor with IP67 Waterproof Rating - Optical Armband Heart Rate Monitor for Peloton, Zwift, Wahoo Fitness, Polar Beat, and Endomondo by Jeremy Taylor

Retinaman says: Arrived on time, well packaged, headband has good elasticity and does not pull on hair. Note LED on the front button and glows through the cover. hold down briefly. he came loaded. Note that charging at one end is via standard USB and a good self-aligning (don't lose) magnetic connection that works well. It immediately connected to my iPhone 11 via Bluetooth. I connected it to my Under Armor app, not two things: first, they want you to connect their own UA HRM, and maybe that will work, but I kept scrolling to add the device to the shared HRM. important: click on connect to the app, THEN switch on the headband and it will be paired immediately. Haven't ridden it yet, but soon. much luck