diff --git a/tests/pingpair_test/pingpair_test.pde b/tests/pingpair_test/pingpair_test.pde
index 192811d..341242d 100644
--- a/tests/pingpair_test/pingpair_test.pde
+++ b/tests/pingpair_test/pingpair_test.pde
@@ -173,7 +173,7 @@ void setup(void)
   if (configuration=='2')
   {
     radio.setCRCLength(RF24_CRC_8);
-    radio.setDataRate(RF24_2MBPS);
+    radio.setDataRate(RF24_250KBPS);
     radio.setChannel(10);
   }
   else
diff --git a/tests/pingpair_test/runtests.sh b/tests/pingpair_test/runtests.sh
index 3c1e942..c68a0a2 100755
--- a/tests/pingpair_test/runtests.sh
+++ b/tests/pingpair_test/runtests.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # Connect p6 to receiver, p4 to sender
+# WARNING: Test config 2 only works with PLUS units.
 
 jam p4 p6 || exit 1
 ./runtest.py /dev/tty.usbserial-A600eHIs 3 &