diff --git a/components/axp192/axp192.h b/components/axp192/axp192.h
index 1385f61..3c43b3f 100644
--- a/components/axp192/axp192.h
+++ b/components/axp192/axp192.h
@@ -11,6 +11,7 @@ namespace axp192 {
 enum AXP192Model {
   AXP192_M5STICKC = 0,
   AXP192_M5CORE2,
+  AXP192_M5TOUGH,
 };
 
 #define SLEEP_MSEC(us) (((uint64_t)us) * 1000L)