Ember js checkbox value

I'm new to Ember and this drives me crazy. I've read checkbox documentation several times but I still don't understand. I have form for adding employees and need to be able to choose employee's education level. I know that should be the select box but task says checkboxes. So, I have few checkboxes and I should be able to pass values from checked ones to action handler and to save them but i don't know how to assign value to checkbox(from docs I got that i should use checked instead value but don't know how).

Thanks in advance and sorry for noob question