The Importance of the "Kada"
Every devotee of Gurudev wears a "Kada". Normally a person is blessed with the "Kada" on his first visit to the Guru-Sthaan itself.
The "Kada" that Gurudev blesses and gives to everyone is made up of Copper and Silver. The Copper portion signifies Lord Shiva and the Silver portion signifies Maa Parvati (Shakti)
The "Kada" enables a physical and spiritual link with Gurudev. It also provides a link of the body with the soul (physical and spiritual link).
The powers of "Shakti" in the "Kada" pulls out the problems of a person. The problems that are pulled out, need to be submitted to a power that can handle them. They are submitted ("samarpit") to the powers of Lord Shiva which are also present in the "Kada".
The "Kada" also provides an all time protection to the person wearing it even when the person is physically at a distance from Gurudev, because through the link of the "Kada", Gurudev is spiritually always present for the help of His children.
The Scientific Importance
of the "Kada" : People use stabilizers for all machineries and electrical equipment in their homes, but ignore their body, which is the most intricately built sensitive machine of GOD. The atmosphere is full of cosmic rays which come from the Sun and other heavenly bodies. Every person's resistance in terms of these rays is different. It can be understood in a simple way - some people can withstand heat much more than others OR, some have a stamina against infections more than others.