How to change two select> option dropdown in the same time

I want that when I select an option from one dropdown,at the same time other dropdown value should change according to the first one.

For example: if I choose 'Value 1' from 'dropdown 1' , then in 'dropdown 2' it should change automatically to the same value('Value 1').

Can anyone help-me please? I thank you in advance!

Here is my Demo.

DEMO

<select name="" id="">
  <option value="">Select</option>
  <option value="">Value 1</option>
  <option value="">Value 2</option>
</select>

<select name="" id="">
   <option value="">Select</option>
   <option value="">Value 1</option>
   <option value="">Value 2</option>
</select>