This is the name which will appear on the EDIT page

Single word, no spaces. Underscores and dashes allowed

Enter each choice on a new line. For more control, you may specify both a value and label like this: <span class='acf-field-setting-example'>red : Red</span>

Enter each default value on a new line

Specify the value returned

Allow content editors to select multiple values

Use a stylized checkbox using select2