diff --git a/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/Metro M4 Airlift Shield Passthru.UF2 b/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/Metro M4 Airlift Shield Passthru.UF2
new file mode 100755
index 000000000..d9bc1a7be
Binary files /dev/null and b/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/Metro M4 Airlift Shield Passthru.UF2 differ
diff --git a/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino b/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino
index f6fd2a323..e2044d6eb 100644
--- a/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino
+++ b/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino
@@ -67,6 +67,14 @@ unsigned long baud = 115200;
   #define SPIWIFI_ACK    7  // a.k.a BUSY or READY pin
   #define ESP32_GPIO0   -1
   #define NEOPIXEL_PIN   8
+#elif defined(ADAFRUIT_METRO_M4_EXPRESS) || defined(ARDUINO_SAMD_METRO_M4)
+  #define SerialESP32   Serial1
+  #define SPIWIFI       SPI
+  #define SPIWIFI_SS    10    // AirLift CS
+  #define ESP32_RESETN   5    // AirLift RESET
+  #define SPIWIFI_ACK    7    // AirLift BUSY / READY
+  #define ESP32_GPIO0    6    // AirLift GPIO0 (boot)
+  #define NEOPIXEL_PIN  40    // Metro M4 onboard NeoPixel
 #elif !defined(SPIWIFI_SS)  // if the wifi definition isnt in the board variant
   // Don't change the names of these #define's! they match the variant ones
   #define SerialESP32   Serial1