diff --git a/audio/bus_mallets.mp3 b/audio/bus_mallets.mp3
new file mode 100644
index 0000000000000000000000000000000000000000..349a39fb0a7162ef32ebc42c241bb547b99a6e4d
Binary files /dev/null and b/audio/bus_mallets.mp3 differ
diff --git a/audio/bus_mallets.wav b/audio/bus_mallets.wav
new file mode 100644
index 0000000000000000000000000000000000000000..7b4446334b3a9449574ba65eafe6f66c03bc6283
Binary files /dev/null and b/audio/bus_mallets.wav differ
diff --git a/audio/car_marimba.mp3 b/audio/car_marimba.mp3
new file mode 100644
index 0000000000000000000000000000000000000000..873a214bd00e9aff532f6a9897f6d554fc29f08e
Binary files /dev/null and b/audio/car_marimba.mp3 differ
diff --git a/audio/car_marimba.wav b/audio/car_marimba.wav
new file mode 100644
index 0000000000000000000000000000000000000000..c540a7dc72b5b44e8d85cd2f6f6198e5f244b2d2
Binary files /dev/null and b/audio/car_marimba.wav differ
diff --git a/audio/truck_glockenspiel.mp3 b/audio/truck_glockenspiel.mp3
new file mode 100644
index 0000000000000000000000000000000000000000..1f6c24dd06efe67a066d3fd466bf6202fa127d15
Binary files /dev/null and b/audio/truck_glockenspiel.mp3 differ
diff --git a/audio/truck_glockenspiel.wav b/audio/truck_glockenspiel.wav
new file mode 100644
index 0000000000000000000000000000000000000000..1d7eaabb1b60d0333517398c4ee4bf941167f994
Binary files /dev/null and b/audio/truck_glockenspiel.wav differ
diff --git a/paavo.html b/paavo.html
index ac9c428c7791329656969ad452eabb1a70da3c8c..80c64e1243f770a73088c458f0c1a9aa3aa3e3c2 100644
--- a/paavo.html
+++ b/paavo.html
@@ -40,12 +40,19 @@
     VEHICLE_TRUCK = 2;
     VEHICLE_BUS = 3;
 
+    AUDIO = {};
+    // Wav files are also available.
+    AUDIO[VEHICLE_CAR] = 'audio/car_marimba.mp3';
+    AUDIO[VEHICLE_TRUCK] = 'audio/truck_glockenspiel.mp3';
+    AUDIO[VEHICLE_BUS] = 'audio/bus_mallets.mp3';
+
     SEP = ',';
     SERVER = 'wss://smarter-data.tt.utu.fi/ws/';
     // SERVER = 'ws://localhost:8080/'
 
     function send_data(ws, direction, vehicle_class) {
       ws.send(TMS_NUMBER + SEP + direction + SEP + vehicle_class + SEP + new Date().getTime());
+      new Audio(AUDIO[vehicle_class]).play();
     }
   </script>