Indicator RVI_Histogram provides alerts and sends email and push notifications when the main and signal lines intersect, accompanied by a change in the color of the signal cloud.

//+-----------------------------------+  //|   INDICATOR INPUT PARAMETERS      |  //+-----------------------------------+  input uint RVIPeriod=14;                       // indicator period  input double HighLevel=+0.3;                   // overbought level  input double LowLevel=-0.3;                    // oversold level  input int Shift=0;                             // Horizontal shift of the indicator in bars  input uint NumberofBar=1;       // Bar number to activate a signal  input bool SoundON=true;        // Enable an alert  input uint NumberofAlerts=2;    // Number of alerts  input bool EMailON=false;       // Enable mailing the signal  input bool PushON=false;        // Enable sending the signal to mobile devices  

Fig1. Indicator RVI_Histogram_Alert. Intersection of the main and signal lines

Fig. 2. RVI_Histogram_Alert. Activating an alert.