diff --git a/cava_run.sh b/cava_run.sh
index 08e414b..8005b82 100755
--- a/cava_run.sh
+++ b/cava_run.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-SERIAL=/dev/ttyACM0
+SERIAL=${1:-/dev/ttyACM0}
 
 sudo stty -F $SERIAL cs8 -cstopb -parenb 1000000
 (cava cava -p ./config | sudo tee $SERIAL) >/dev/null