Every Hindu temple has a bell either at the Temple entrance or, more often, inside the temple. It is rung whenever devotees comes for worship or meditation.
Everything inside a Hindu temple has science and logic behind it.
The bell is intentionally crafted from a variety of metals including: cadmium, lead, copper, zinc, nickel, chromium and magnesium. The metallic combination results in a bell ring designed to balance right and left sides of the brain; radiate positive energy into the body driving away negative energies. Also, the temple bell generates a sharp sound which lasts seven seconds coordinating and harmonizing the seven chakras of the body.
Finally, the loud sound also empties the mind of thoughts bringing a devotee back to the breath and to meditation.