Checkbox for Drupal CCK

I am new to Drupal. love it so far :)

I am creating a custom CCK content type. I need to make a list of amenities in a checkbox. so i did;

File type: Text

Widget type: Checkboxes / Radio Buttons

and a list of valid values:

onsite_dining | Organization on site

meeting_space | Meeting place

business_center | Business center

and it creates radio buttons that have only 1 selection: (How can I make this a checkbox to allow more than 1 to be selected?

Know what helps!