This is Mrtools's Jurik RBCI Bands with Divergence. It uses RBCI (Range Bound Channel Index) and is a very capable tool for scalping trends and reversals.

Mrtools has covered the RBCI in his post about Digital Filters here and just to recap:

Range Bound Channel Index - is an overall sum of all main market cycles. Range filter parameters are selected from the current market spectrum. In simplified formula RBCI (k) = FATL (k)-SATL (k). RBCI is a quasi-stationary process that is a process with bound spectrum. When RBCI approaches its local maximum the prices approach the upper border of the trading channel and when RBCI approaches its local minimum the prices approach the lower border of the trading channel.

Thanks Mrtools!