Thanks to answer this post, My friends, Mackguyver, BL, Sama, Zim and Jpaz.
Yes, This Hood with the Magnify Lens can snap off from the magnetic frame in mili-second, After we use our finger touch the LCD screen to set the function, and snap the hood Back.
Yes, before I get this Hood, In the bright sun shine, EOS-M LCD almost useless to see the View, I have to guess and Shoot as the blind man.
Yes, Some company sell $ 12 US Dollars in E-Bay----Thanks.
PS, Dear my Friend Mr. Mackguyver
"My only question about this set up is -- have you accidentally tried to look through the lens yet? It looks like it would be easy to do "---Yes, That happen yesterday , in the bright sun shine day,I try to snap shot, When I look in to the Front of the lens( Nervous Old man) and see the black color of the Cir. PL Filter------I just cry out loud = Oh, My God, I am too old to see this beautiful young lady with super mini skirt with beautiful long / perfected legs---Ha, Ha, Ha, Too late, She walk away.