diff --git a/inc/MicroBitConfig.h b/inc/MicroBitConfig.h
index 6755986..5e27682 100644
--- a/inc/MicroBitConfig.h
+++ b/inc/MicroBitConfig.h
@@ -157,6 +157,14 @@
 #define MICROBIT_BLE_ADVERTISING_TIMEOUT    0
 #endif
 
+// Defines default power level of the BLE radio transmitter.
+// Valid values are in the range 0..7 inclusive, with 0 being the lowest power and 7 the highest power.
+// Based on trials undertaken by the BBC, the radio is normally set to its lowest power level
+// to best protect children's privacy. 
+#ifndef MICROBIT_BLE_DEFAULT_TX_POWER
+#define MICROBIT_BLE_DEFAULT_TX_POWER       0
+#endif
+
 // Enable/Disable BLE Service: MicroBitDFU
 // This allows over the air programming during normal operation.
 // Set '1' to enable. 
diff --git a/source/ble-services/MicroBitBLEManager.cpp b/source/ble-services/MicroBitBLEManager.cpp
index 8356994..6ec9130 100644
--- a/source/ble-services/MicroBitBLEManager.cpp
+++ b/source/ble-services/MicroBitBLEManager.cpp
@@ -154,6 +154,9 @@ void MicroBitBLEManager::init(ManagedString deviceName, ManagedString serialNumb
     ble->gap().setAdvertisingPolicyMode(Gap::ADV_POLICY_FILTER_CONN_REQS);
 #endif    
 
+    // Configure the radio at our default power level
+    setTransmitPower(MICROBIT_BLE_DEFAULT_TX_POWER); 
+
     // Bring up any configured auxiliary services.
 #if CONFIG_ENABLED(MICROBIT_BLE_DFU_SERVICE)
     new MicroBitDFUService(*ble);