Heart rate monitor works but not practical

This heart rate monitor is a fallback for those whose phone does not support Bluetooth Low Energy (in my case). Overall, the product works as expected. Measuring heart rate appears reasonably accurate. Listening to music continues to operate. For now, I have not had to change batteries (after twenty sessions, I think).

By cons, even if it is a default solution is still a flawed solution. Given its size, when it is not on the phone, the transmitter may be lost quickly. And once on the phone with the addition of headphones plugged over, it gives a rather precarious mounting and requires a lot of precautions fairly consistent with the expected use of context (ie, a workout).