diff --git a/Include/config.h b/Include/config.h
--- a/Include/config.h
+++ b/Include/config.h
@@ -10,6 +10,8 @@
 // Transmitter config (si446x.c)
 // --------------------------------------------------------------------------
 
+// Transmit power (0-0x7F, 0mW - 40mw?)
+#define SI446x_POWER 0x02
 
 #define TUNE_FREQUENCY 433000000UL