You would be 100% correct, @Gerrie_Delport_ODZ .
I’ve owned several of those - they’re the ONLY Garmin HRM (the HRM-1G, if you’re trying to find one) that are practically indestructible. ANT+ only, no BLE, but unkillable. I’ve found them for $2.00CAD ($1.59 with a coupon LOL) at local thrift stores and love to keep one as a backup.