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If you want, you can disable the WiFi by:
#include <ESP8266WiFi.h> // for WIFI_OFF
//*****************************************************************************
// Operational Parameters:
//*****************************************************************************
//*****************************************************************************
// Pin Assignments:
//*****************************************************************************
// Prototypes:
//*****************************************************************************
// device setup:
//*****************************************************************************
void setup()
{
// Disable WiFi radio:
WiFi.disconnect(); // probably the same as WiFi.mode (WIFI_OFF)
//alternate code: WiFi.mode( WIFI_OFF );
WiFi.forceSleepBegin();
delay(2); // needed for some unknown reason