diff --git a/LightAPRS-hab/LightAPRS-hab.ino b/LightAPRS-hab/LightAPRS-hab.ino
index 1f03642..83ed31b 100644
--- a/LightAPRS-hab/LightAPRS-hab.ino
+++ b/LightAPRS-hab/LightAPRS-hab.ino
@@ -46,7 +46,7 @@ char StatusMessage[50] = "LightAPRS by TA9OHC & TA2MUN";
 unsigned int   BeaconWait=60;  //seconds sleep for next beacon (TX).
 unsigned int   BattWait=60;    //seconds sleep if super capacitors/batteries are below BattMin (important if power source is solar panel) 
 float BattMin=4.5;        // min Volts to wake up.
-float DraHihgVolt=4.8;    // min Volts for radio module (DRA818V) to transmit (TX) 1 Watt, below this transmit 0.5 Watt.
+float DraHighVolt=4.8;    // min Volts for radio module (DRA818V) to transmit (TX) 1 Watt, below this transmit 0.5 Watt.
 float GpsMinVolt=4.0; //min Volts for GPS to wake up. (important if power source is solar panel) 
 
 boolean aliveStatus = true; //for tx status message on first wake-up just once.
@@ -334,7 +334,7 @@ void sendLocation() {
 #if defined(DEVMODE)
       Serial.println(F("Location sending with comment"));
 #endif
-  if (readBatt() > DraHihgVolt) RfPwrHigh; //DRA Power 1 Watt
+  if ((readBatt() > DraHighVolt) && (readBatt() < 10)) RfPwrHigh; //DRA Power 1 Watt
   else RfPwrLow; //DRA Power 0.5 Watt
 
   int hh = gps.time.hour();
@@ -368,7 +368,7 @@ void sendLocation() {
 }
 
 void sendStatus() {
-  if (readBatt() > DraHihgVolt) RfPwrHigh; //DRA Power 1 Watt
+  if ((readBatt() > DraHighVolt) && (readBatt() < 10)) RfPwrHigh; //DRA Power 1 Watt
   else RfPwrLow; //DRA Power 0.5 Watt
 
   RfON;
diff --git a/LightAPRS-pico-balloon/LightAPRS-pico-balloon.ino b/LightAPRS-pico-balloon/LightAPRS-pico-balloon.ino
index 76f74fd..cc7acb7 100644
--- a/LightAPRS-pico-balloon/LightAPRS-pico-balloon.ino
+++ b/LightAPRS-pico-balloon/LightAPRS-pico-balloon.ino
@@ -45,7 +45,7 @@ char StatusMessage[50] = "LightAPRS by TA9OHC & TA2MUN";
 unsigned int   BeaconWait=60;  //seconds sleep for next beacon (TX).
 unsigned int   BattWait=60;    //seconds sleep if super capacitors/batteries are below BattMin (important if power source is solar panel) 
 float BattMin=4.5;        // min Volts to wake up.
-float DraHihgVolt=5.0;    // min Volts for radio module (DRA818V) to transmit (TX) 1 Watt, below this transmit 0.5 Watt.
+float DraHighVolt=5.0;    // min Volts for radio module (DRA818V) to transmit (TX) 1 Watt, below this transmit 0.5 Watt.
 float GpsMinVolt=4.0; //min Volts for GPS to wake up. (important if power source is solar panel) 
 
 boolean aliveStatus = true; //for tx status message on first wake-up just once.
@@ -403,7 +403,7 @@ void sendLocation() {
 #if defined(DEVMODE)
       Serial.println(F("Location sending with comment"));
 #endif
-  if (readBatt() > DraHihgVolt) RfPwrHigh; //DRA Power 1 Watt
+  if ((readBatt() > DraHighVolt) && (readBatt() < 10)) RfPwrHigh; //DRA Power 1 Watt
   else RfPwrLow; //DRA Power 0.5 Watt
 
   int hh = gps.time.hour();
@@ -437,7 +437,7 @@ void sendLocation() {
 }
 
 void sendStatus() {
-  if (readBatt() > DraHihgVolt) RfPwrHigh; //DRA Power 1 Watt
+  if ((readBatt() > DraHighVolt) && (readBatt() < 10)) RfPwrHigh; //DRA Power 1 Watt
   else RfPwrLow; //DRA Power 0.5 Watt
 
   RfON;
diff --git a/LightAPRS-vehicle/LightAPRS-vehicle.ino b/LightAPRS-vehicle/LightAPRS-vehicle.ino
index 21dc150..f3d37c1 100644
--- a/LightAPRS-vehicle/LightAPRS-vehicle.ino
+++ b/LightAPRS-vehicle/LightAPRS-vehicle.ino
@@ -46,7 +46,7 @@ char StatusMessage[50] = "LightAPRS by TA9OHC & TA2MUN";
 unsigned int   BeaconWait=60;  //seconds sleep for next beacon (TX).
 unsigned int   BattWait=60;    //seconds sleep if super capacitors/batteries are below BattMin (important if power source is solar panel) 
 float BattMin=4.5;        // min Volts to wake up.
-float DraHihgVolt=4.8;    // min Volts for radio module (DRA818V) to transmit (TX) 1 Watt, below this transmit 0.5 Watt.
+float DraHighVolt=8.0;    // max Volts for radio module (DRA818V) to transmit (TX) 1 Watt, above this transmit 0.5 Watt. Do not increase this value to avoid overheating.
 float GpsMinVolt=4.0; //min Volts for GPS to wake up. (important if power source is solar panel) 
 
 boolean aliveStatus = true; //for tx status message on first wake-up just once.
@@ -337,7 +337,7 @@ void sendLocation() {
 #if defined(DEVMODE)
       Serial.println(F("Location sending with comment"));
 #endif
-  if (readBatt() > DraHihgVolt) RfPwrHigh; //DRA Power 1 Watt
+  if (readBatt() < DraHighVolt) RfPwrHigh; //DRA Power 1 Watt
   else RfPwrLow; //DRA Power 0.5 Watt
 
   int hh = gps.time.hour();
@@ -371,8 +371,9 @@ void sendLocation() {
 }
 
 void sendStatus() {
-  if (readBatt() > DraHihgVolt) RfPwrHigh; //DRA Power 1 Watt
+  if (readBatt() < DraHighVolt) RfPwrHigh; //DRA Power 1 Watt
   else RfPwrLow; //DRA Power 0.5 Watt
+  
   AprsPinOutput;
   RfON;
   delay(2000);
diff --git a/README.md b/README.md
index 661bbea..384ac40 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ LightAPRS is available on http://www.qrp-labs.com/lightaprs.html for order.
 - **EEPROM** : 4 kB
 - **Operating Frequency** : 8 Mhz
 - **Operating Voltage** : 3.3 Volt
-- **Input Voltage** : 3.3 Volt (via 3.3V pin) or  4.5 (min) - 15 (max) Volt via usb or VBat pin
+- **Input Voltage** : 4.5 (min) - 15 (max) Volt for 0.5 Watt / 4.5 (min) - 10 (max) Volt for 1 Watt via usb or VBat pin
 - **BOD** : 2.7 Volt
 - **Sensor** : BMP180 (pressure and temperature)
 - **Radio Module** : [Dorji DRA818V](http://www.dorji.com/products-detail.php?ProId=55) (included)
@@ -31,7 +31,7 @@ LightAPRS is available on http://www.qrp-labs.com/lightaprs.html for order.
 - **Low Pass Filter** : Available (7 elements)
 - **Radio Power**  : 0.5 Watt or 1 Watt (configurable by code)
 - **Power Consumption (Sleep)** : ~5 mA
-- **Power Consumption (TX)** : ~460 mA (0.5 Watt) / ~760 mA (1 Watt)
+- **Power Consumption (TX)** : ~460 mA (0.5 Watt) / ~760 mA (1 Watt) (Automatically selected based on input voltage by code)
 - **GPS** : Ublox MAX-M8Q (GPS-GLONASS)
 - **GPS Antenna Gain** : 4.3 dBi
 - **Extended Pins** : I2C, SPI