Multiple selectors in Dom7?

Questions
1

Can we not use multiple selectors in Dom7?

var btnOne = document.getElementById('item1');
var btnTwo = document.getElementById('item2');

$$(btnOne, btnTwo ).on('click', function() {
    // My code here...
});

This does not seem to work for me.

2 
$$([btnOne, btnTwo]).on(...
3

I get an error: Uncaught (in promise) TypeError: Cannot read property ‘dom7Listeners’ of undefined