Hey! This is another version of the Canon wired remote. I think it is more flexible than the other designs. This instructable
is where I got my inspiration from.
This basically allows you to take pictures using this remote instead of pushing the button on the camera. The Canon-branded remote is around $25.
This remote uses common parts and requires little soldering. The best part is that the cable is easy to replace - just walk over to a dollar store and buy a longer cable! No soldering required for the extension!
The approximate cost for parts is less than $10!