If you can get a signal but it seems to be poor or inconsistent, first try the following tips in this article to get a clean recording and learn how to interact with the KardiaMobile hardware.
If you can not seem to get a signal at all, please take a look at this article to work through some common issues working through software issues to get a signal.
If neither of the above helps, you may simply have a worn out battery. Take a look at this article to learn how to replace the KardiaMobile battery yourself.
If none of the above works, please reach out to us by submitting a support ticket here and we will help troubleshoot the issue.