diff --git a/files/low_battery.m4a b/files/low_battery.m4a
new file mode 100644
index 0000000..037feba
Binary files /dev/null and b/files/low_battery.m4a differ
diff --git a/files/low_battery.mkv b/files/low_battery.mkv
deleted file mode 100644
index 3759232..0000000
Binary files a/files/low_battery.mkv and /dev/null differ
diff --git a/tasks/main.yml b/tasks/main.yml
index bd9c181..707a597 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -14,8 +14,8 @@
 - name: copy sound warning video
   become: yes
   copy:
-    src: 'files/low_battery.mkv'
-    dest: '/opt/low_battery.mkv'
+    src: 'files/low_battery.m4a'
+    dest: '/opt/low_battery.m4a'
     owner: 'root'
     group: 'root'
     mode: '0644'
diff --git a/vars/main.yml b/vars/main.yml
index 63f1d4d..e8ae725 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -1,3 +1,3 @@
 ---
-playbook_version_number: 103
+playbook_version_number: 104
 playbook_version_path: '/etc/ansible-version/role-akku-warning_chaos-bodensee_github.com.version'