I got a pacemaker a few months ago and the hospital helped me set up the app. Never had any technical or communication issues. It does not drain battery despite being on constantly in the background. My phone’s battery has not dipped below 80% even when I’m out all day - even though my phone is several years old. This app means I don’t need a separate device on my bedside table every night which also means one less thing to remember when travelling. My one disappointment is that the recorded data is not available for the user to see.