Shri Ghantakarna Mahavir Yantra is worshiped for protection. Shri Ghantakarna Mahavir Yantra counters bad luck and brings prosperity and happiness in your life with in matter of days. He is a protector Jain deity.
Yantra Mantra Sadhana Aur Siddhi has 2 parts, one is Durlabh Mantra Khand and 2nd is Durlabh Yantra Khand. The Mantra Khand and The Yantra Khand has many mantras and Yantras that Aurhor Surendranath have collected and practiced from very old and ancient text which are almost extincted from this human world.