I purchased an HS200 switch because I saw I had a white wire in the box of my previous switch. Today I am trying to install it and see that I only have 1 white and 1 black wire. I assume the black wire is the line wire. Is the white wire load AND neutral? Can this switch be used in this set up? I also have a bare copper wire for neutral. 
 

For context there is currently a dimmer switch in this box. I don't need the dimmer functionality. I just would like to have a smart on/off switch. 
 

Thanks in advance for your help.